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Canada ISED
Cell Sites Canadian sites: ISED Terrestrial Spectrum Licence Site Data. US sites: FCC ULS cellular (l_cell) — public domain. US sites are a location + band layer. A licensed ERP (and so a modelled signal in TSCM mode) is on file for only ~17% of US sites. The rest show as unknown power — which is not the same as no emission.
ISED Terrestrial + FCC l_cell
Satellite Earth Stations
ISED Satellite Site Data
6 GHz Fixed Links AFC
ISED AFC Stations Data Extract
Amateur Operators by FSA Aggregate operator counts per Forward Sortation Area — no individual locations. FSA centroids © GeoNames (CC-BY).
ISED Amateur Radio Operators
Registration Changes monthly diff New / modified / removed licences between ISED TAFL releases — a removed emitter's silence is expected; a still-active one near a change is worth a look.
New Modified Removed
United States FCC
Antenna Structures ASR US antenna structures (towers) — location and height only. No RF power is registered, so these are never given a modelled signal and are never filtered out by signal strength.
FCC ASR — public domain
Microwave US fixed point-to-point microwave emitters — modelled signal (FSPL + building) in TSCM mode.
FCC ULS l_micro — public domain
Land Mobile US land-mobile (LMR) fixed-location emitters — modelled signal (FSPL + building) in TSCM mode.
FCC ULS l_LMcomm + l_LMpriv — public domain
Maritime Coast US coast, marine-utility and shore radionavigation stations (47 CFR Part 80) — marine VHF and HF SSB, modelled signal (FSPL + building) in TSCM mode. Ship stations are not included. The FCC dump carries no location or frequency record for them, so their absence here is a data gap, not an all-clear.
FCC ULS l_coast — public domain
Aeronautical US airport, air-traffic and navaid ground stations (47 CFR Part 87) — control towers, UNICOM, ATIS/AWOS, ground control, ILS localizer and glide path, VOR, NDB and airport radar; modelled signal (FSPL + building) in TSCM mode. Navaids and weather loops are flagged continuous; towers and test benches intermittent. Aircraft stations are not included. The FCC dump carries no location or frequency record for them, so their absence here is a data gap, not an all-clear.
FCC ULS l_coast — public domain
Paging / Public Mobile US Part 22 public-mobile land stations — paging base stations plus rural, offshore and general-aviation air-ground radiotelephone; modelled signal (FSPL + building) in TSCM mode from a registered ERP. Paging transmitters are licensed to as much as 3500 W ERP at 931–932 MHz (47 CFR 22.535), which makes them among the strongest fixed UHF emitters near most sites — worth accounting for before anything nearby is called anomalous. Duty cycle is reported intermittent: a pager keys for traffic, and nothing cited supports calling its carrier always-on.
FCC ULS l_paging — public domain
Earth Stations IBFS US licensed satellite earth stations (47 CFR Part 25) — VSAT hubs, gateways, teleports and TT&C sites. Transmitting stations get a modelled signal (FSPL + building) in TSCM mode from a licensed EIRP. Frequencies are licensed band edges, not a measured centre. About three-quarters are receive-only and radiate nothing: those are drawn as hollow diamonds, badged RX-only, and carry no modelled signal — a large dish is a real installation worth knowing about, but it is not an emitter.
FCC IBFS — public domain
Broadcast AM/FM/TV US AM / FM / TV broadcast facilities. FM and TV carry a licensed ERP — modelled signal (FSPL + building) in TSCM mode. AM has no valid signal model — it is MF ground-wave, which FSPL does not describe. AM facilities are kept and shown without a modelled level, and are never filtered out as if they were RF-clear.
FCC LMS — public domain
Amateur Operators by ZIP Aggregate licensed-operator counts per 5-digit ZIP with an operator-class breakdown — no individual locations, names or addresses. ZIP centroids: US Census ZCTA Gazetteer (public domain).
FCC ULS l_amat — public domain

Filter to signals detectable inside a structure

De-weight a directional emitter by its 3GPP off-axis pattern toward the pin (transmitters with a main lobe only).

De-weight by ITM terrain diffraction over the DEM path to the pin. Computed on demand for this location (in the background); emitters off the DEM or outside ITM's 20 MHz–20 GHz band fall back to free-space.

Elevation: SRTM (NASA/USGS), 20 MHz–20 GHz. Terrain is a planning estimate, not a guarantee of (non-)detectability.
Site Calibration

Corrects a shared site bias, not per-path error — only as good as the reference emitter's own ERP. Clamped to ±20 dB.

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