diff --git a/backend/app/routers/devices.py b/backend/app/routers/devices.py
index ad8508d..e4531cd 100644
--- a/backend/app/routers/devices.py
+++ b/backend/app/routers/devices.py
@@ -87,6 +87,8 @@ async def list_devices(
     group_id: Optional[uuid.UUID] = Query(None),
     sort_by: str = Query("created_at", description="Field to sort by"),
     sort_order: str = Query("desc", description="asc or desc"),
+    site_id: Optional[uuid.UUID] = Query(None, description="Filter by site"),
+    sector_id: Optional[uuid.UUID] = Query(None, description="Filter by sector"),
     current_user: CurrentUser = Depends(get_current_user),
     db: AsyncSession = Depends(get_db),
 ) -> DeviceListResponse:
@@ -104,6 +106,8 @@ async def list_devices(
         group_id=group_id,
         sort_by=sort_by,
         sort_order=sort_order,
+        site_id=site_id,
+        sector_id=sector_id,
     )
     return DeviceListResponse(items=items, total=total, page=page, page_size=page_size)
 
diff --git a/backend/app/routers/links.py b/backend/app/routers/links.py
index ff8a9e7..7e9b201 100644
--- a/backend/app/routers/links.py
+++ b/backend/app/routers/links.py
@@ -18,7 +18,12 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from app.database import get_db
 from app.middleware.tenant_context import CurrentUser, get_current_user
 from app.routers.devices import _check_tenant_access
-from app.schemas.link import LinkListResponse, UnknownClientListResponse
+from app.schemas.link import (
+    LinkListResponse,
+    RegistrationListResponse,
+    RFStatsListResponse,
+    UnknownClientListResponse,
+)
 from app.services import link_service
 
 router = APIRouter(tags=["links"])
@@ -73,6 +78,38 @@ async def list_site_links(
     return await link_service.get_site_links(db=db, tenant_id=tenant_id, site_id=site_id)
 
 
+@router.get(
+    "/tenants/{tenant_id}/devices/{device_id}/registrations",
+    response_model=RegistrationListResponse,
+    summary="List device wireless registrations",
+)
+async def list_device_registrations(
+    tenant_id: uuid.UUID,
+    device_id: uuid.UUID,
+    current_user: CurrentUser = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+) -> RegistrationListResponse:
+    """Get latest wireless registration data for a device (most recent per MAC)."""
+    await _check_tenant_access(current_user, tenant_id, db)
+    return await link_service.get_device_registrations(db=db, tenant_id=tenant_id, device_id=device_id)
+
+
+@router.get(
+    "/tenants/{tenant_id}/devices/{device_id}/rf-stats",
+    response_model=RFStatsListResponse,
+    summary="List device RF monitor stats",
+)
+async def list_device_rf_stats(
+    tenant_id: uuid.UUID,
+    device_id: uuid.UUID,
+    current_user: CurrentUser = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+) -> RFStatsListResponse:
+    """Get latest RF monitor stats for a device (most recent per interface)."""
+    await _check_tenant_access(current_user, tenant_id, db)
+    return await link_service.get_device_rf_stats(db=db, tenant_id=tenant_id, device_id=device_id)
+
+
 @router.get(
     "/tenants/{tenant_id}/devices/{device_id}/unknown-clients",
     response_model=UnknownClientListResponse,
diff --git a/backend/app/schemas/link.py b/backend/app/schemas/link.py
index 095e00a..6e8b067 100644
--- a/backend/app/schemas/link.py
+++ b/backend/app/schemas/link.py
@@ -54,3 +54,48 @@ class UnknownClientListResponse(BaseModel):
 
     items: list[UnknownClientResponse]
     total: int
+
+
+class RegistrationResponse(BaseModel):
+    """A single wireless registration entry for a device."""
+
+    mac_address: str
+    interface: str | None = None
+    signal_strength: int | None = None
+    tx_ccq: int | None = None
+    tx_rate: str | None = None
+    rx_rate: str | None = None
+    distance: int | None = None
+    uptime: str | None = None
+    last_seen: datetime
+    hostname: str | None = None
+    device_id: str | None = None
+
+    model_config = ConfigDict(from_attributes=True)
+
+
+class RegistrationListResponse(BaseModel):
+    """List of wireless registrations with total count."""
+
+    items: list[RegistrationResponse]
+    total: int
+
+
+class RFStatsResponse(BaseModel):
+    """RF monitor stats for a single interface."""
+
+    interface: str
+    noise_floor: int | None = None
+    channel_width: int | None = None
+    tx_power: int | None = None
+    registered_clients: int | None = None
+    last_seen: datetime
+
+    model_config = ConfigDict(from_attributes=True)
+
+
+class RFStatsListResponse(BaseModel):
+    """List of RF stats with total count."""
+
+    items: list[RFStatsResponse]
+    total: int
diff --git a/backend/app/services/device.py b/backend/app/services/device.py
index ce7c715..6eb9675 100644
--- a/backend/app/services/device.py
+++ b/backend/app/services/device.py
@@ -197,6 +197,8 @@ async def get_devices(
     group_id: Optional[uuid.UUID] = None,
     sort_by: str = "created_at",
     sort_order: str = "desc",
+    site_id: Optional[uuid.UUID] = None,
+    sector_id: Optional[uuid.UUID] = None,
 ) -> tuple[list[DeviceResponse], int]:
     """
     Return a paginated list of devices with optional filtering and sorting.
@@ -235,6 +237,12 @@ async def get_devices(
             )
         )
 
+    if site_id:
+        base_q = base_q.where(Device.site_id == site_id)
+
+    if sector_id:
+        base_q = base_q.where(Device.sector_id == sector_id)
+
     # Count total before pagination
     count_q = select(func.count()).select_from(base_q.subquery())
     total_result = await db.execute(count_q)
diff --git a/backend/app/services/link_service.py b/backend/app/services/link_service.py
index d3bf6e3..e60b855 100644
--- a/backend/app/services/link_service.py
+++ b/backend/app/services/link_service.py
@@ -14,6 +14,10 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from app.schemas.link import (
     LinkListResponse,
     LinkResponse,
+    RegistrationListResponse,
+    RegistrationResponse,
+    RFStatsListResponse,
+    RFStatsResponse,
     UnknownClientListResponse,
     UnknownClientResponse,
 )
@@ -180,3 +184,92 @@ async def get_unknown_clients(
     ]
 
     return UnknownClientListResponse(items=items, total=len(items))
+
+
+async def get_device_registrations(
+    db: AsyncSession,
+    tenant_id: uuid.UUID,
+    device_id: uuid.UUID,
+) -> RegistrationListResponse:
+    """Get latest wireless registration data for a device (most recent per MAC address).
+
+    Uses DISTINCT ON to return the most recent registration per unique MAC address.
+    Attempts to resolve MAC addresses to known device hostnames via device_interfaces.
+    """
+    result = await db.execute(
+        text("""
+            SELECT DISTINCT ON (wr.mac_address)
+                   wr.mac_address, wr.interface, wr.signal_strength,
+                   wr.tx_ccq, wr.tx_rate, wr.rx_rate,
+                   wr.distance, wr.uptime, wr.time AS last_seen,
+                   di.device_id AS resolved_device_id,
+                   d.hostname AS resolved_hostname
+            FROM wireless_registrations wr
+            LEFT JOIN device_interfaces di
+              ON di.mac_address = wr.mac_address AND di.tenant_id = wr.tenant_id
+            LEFT JOIN devices d
+              ON d.id = di.device_id
+            WHERE wr.device_id = :device_id
+              AND wr.tenant_id = :tenant_id
+            ORDER BY wr.mac_address, wr.time DESC
+        """),
+        {"device_id": str(device_id), "tenant_id": str(tenant_id)},
+    )
+    rows = result.fetchall()
+
+    items = [
+        RegistrationResponse(
+            mac_address=row.mac_address,
+            interface=row.interface,
+            signal_strength=row.signal_strength,
+            tx_ccq=row.tx_ccq,
+            tx_rate=row.tx_rate,
+            rx_rate=row.rx_rate,
+            distance=row.distance,
+            uptime=row.uptime,
+            last_seen=row.last_seen,
+            hostname=row.resolved_hostname,
+            device_id=str(row.resolved_device_id) if row.resolved_device_id else None,
+        )
+        for row in rows
+    ]
+
+    return RegistrationListResponse(items=items, total=len(items))
+
+
+async def get_device_rf_stats(
+    db: AsyncSession,
+    tenant_id: uuid.UUID,
+    device_id: uuid.UUID,
+) -> RFStatsListResponse:
+    """Get latest RF monitor stats for a device (most recent per interface).
+
+    Uses DISTINCT ON to return the most recent stats per unique interface name.
+    """
+    result = await db.execute(
+        text("""
+            SELECT DISTINCT ON (rf.interface)
+                   rf.interface, rf.noise_floor, rf.channel_width,
+                   rf.tx_power, rf.registered_clients, rf.time AS last_seen
+            FROM rf_monitor_stats rf
+            WHERE rf.device_id = :device_id
+              AND rf.tenant_id = :tenant_id
+            ORDER BY rf.interface, rf.time DESC
+        """),
+        {"device_id": str(device_id), "tenant_id": str(tenant_id)},
+    )
+    rows = result.fetchall()
+
+    items = [
+        RFStatsResponse(
+            interface=row.interface,
+            noise_floor=row.noise_floor,
+            channel_width=row.channel_width,
+            tx_power=row.tx_power,
+            registered_clients=row.registered_clients,
+            last_seen=row.last_seen,
+        )
+        for row in rows
+    ]
+
+    return RFStatsListResponse(items=items, total=len(items))
diff --git a/frontend/src/lib/api.ts b/frontend/src/lib/api.ts
index 484078c..853199c 100644
--- a/frontend/src/lib/api.ts
+++ b/frontend/src/lib/api.ts
@@ -566,6 +566,178 @@ export const sitesApi = {
       .then((r) => r.data),
 }
 
+// ─── Sectors ──────────────────────────────────────────────────────────────────
+
+export interface SectorResponse {
+  id: string
+  site_id: string
+  name: string
+  azimuth: number | null
+  description: string | null
+  device_count: number
+  created_at: string
+  updated_at: string
+}
+
+export interface SectorListResponse {
+  items: SectorResponse[]
+  total: number
+}
+
+export interface SectorCreate {
+  name: string
+  azimuth?: number | null
+  description?: string | null
+}
+
+export interface SectorUpdate {
+  name?: string
+  azimuth?: number | null
+  description?: string | null
+}
+
+export const sectorsApi = {
+  list: (tenantId: string, siteId: string) =>
+    api
+      .get<SectorListResponse>(`/api/tenants/${tenantId}/sites/${siteId}/sectors`)
+      .then((r) => r.data),
+
+  create: (tenantId: string, siteId: string, data: SectorCreate) =>
+    api
+      .post<SectorResponse>(`/api/tenants/${tenantId}/sites/${siteId}/sectors`, data)
+      .then((r) => r.data),
+
+  update: (tenantId: string, siteId: string, sectorId: string, data: SectorUpdate) =>
+    api
+      .put<SectorResponse>(
+        `/api/tenants/${tenantId}/sites/${siteId}/sectors/${sectorId}`,
+        data,
+      )
+      .then((r) => r.data),
+
+  delete: (tenantId: string, siteId: string, sectorId: string) =>
+    api
+      .delete(`/api/tenants/${tenantId}/sites/${siteId}/sectors/${sectorId}`)
+      .then((r) => r.data),
+
+  assignDevice: (tenantId: string, deviceId: string, sectorId: string | null) =>
+    api
+      .put(`/api/tenants/${tenantId}/devices/${deviceId}/sector`, {
+        sector_id: sectorId,
+      })
+      .then((r) => r.data),
+}
+
+// ─── Wireless ─────────────────────────────────────────────────────────────────
+
+export interface RegistrationResponse {
+  mac_address: string
+  interface: string | null
+  signal_strength: number | null
+  tx_ccq: number | null
+  tx_rate: string | null
+  rx_rate: string | null
+  distance: number | null
+  uptime: string | null
+  last_seen: string
+  hostname: string | null
+  device_id: string | null
+}
+
+export interface RegistrationListResponse {
+  items: RegistrationResponse[]
+  total: number
+}
+
+export interface RFStatsResponse {
+  interface: string
+  noise_floor: number | null
+  channel_width: number | null
+  tx_power: number | null
+  registered_clients: number | null
+  last_seen: string
+}
+
+export interface RFStatsListResponse {
+  items: RFStatsResponse[]
+  total: number
+}
+
+export interface LinkResponse {
+  id: string
+  ap_device_id: string
+  cpe_device_id: string
+  ap_hostname: string | null
+  cpe_hostname: string | null
+  interface: string | null
+  client_mac: string
+  signal_strength: number | null
+  tx_ccq: number | null
+  tx_rate: string | null
+  rx_rate: string | null
+  state: string
+  missed_polls: number
+  discovered_at: string
+  last_seen: string
+}
+
+export interface LinkListResponse {
+  items: LinkResponse[]
+  total: number
+}
+
+export interface UnknownClientResponse {
+  mac_address: string
+  interface: string | null
+  signal_strength: number | null
+  tx_rate: string | null
+  rx_rate: string | null
+  last_seen: string
+}
+
+export interface UnknownClientListResponse {
+  items: UnknownClientResponse[]
+  total: number
+}
+
+export const wirelessApi = {
+  getLinks: (tenantId: string, params?: { state?: string; device_id?: string }) =>
+    api
+      .get<LinkListResponse>(`/api/tenants/${tenantId}/links`, { params })
+      .then((r) => r.data),
+
+  getSiteLinks: (tenantId: string, siteId: string) =>
+    api
+      .get<LinkListResponse>(`/api/tenants/${tenantId}/sites/${siteId}/links`)
+      .then((r) => r.data),
+
+  getDeviceLinks: (tenantId: string, deviceId: string) =>
+    api
+      .get<LinkListResponse>(`/api/tenants/${tenantId}/devices/${deviceId}/links`)
+      .then((r) => r.data),
+
+  getDeviceRegistrations: (tenantId: string, deviceId: string) =>
+    api
+      .get<RegistrationListResponse>(
+        `/api/tenants/${tenantId}/devices/${deviceId}/registrations`,
+      )
+      .then((r) => r.data),
+
+  getDeviceRFStats: (tenantId: string, deviceId: string) =>
+    api
+      .get<RFStatsListResponse>(
+        `/api/tenants/${tenantId}/devices/${deviceId}/rf-stats`,
+      )
+      .then((r) => r.data),
+
+  getUnknownClients: (tenantId: string, deviceId: string) =>
+    api
+      .get<UnknownClientListResponse>(
+        `/api/tenants/${tenantId}/devices/${deviceId}/unknown-clients`,
+      )
+      .then((r) => r.data),
+}
+
 // ─── Metrics ──────────────────────────────────────────────────────────────────
 
 export interface HealthMetricPoint {