FM RF exposure

Begin with your station

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Prefer to enter everything by hand? Use the fields below.

Unitsmetersfeet

Height reference surfacethe grounda rooftop people can reach

Check distance from tower

Null fill or beam tilt: use the peak line (FCC method)

Your station

Channel201 (88.1 MHz)202 (88.3 MHz)203 (88.5 MHz)204 (88.7 MHz)205 (88.9 MHz)206 (89.1 MHz)207 (89.3 MHz)208 (89.5 MHz)209 (89.7 MHz)210 (89.9 MHz)211 (90.1 MHz)212 (90.3 MHz)213 (90.5 MHz)214 (90.7 MHz)215 (90.9 MHz)216 (91.1 MHz)217 (91.3 MHz)218 (91.5 MHz)219 (91.7 MHz)220 (91.9 MHz)221 (92.1 MHz)222 (92.3 MHz)223 (92.5 MHz)224 (92.7 MHz)225 (92.9 MHz)226 (93.1 MHz)227 (93.3 MHz)228 (93.5 MHz)229 (93.7 MHz)230 (93.9 MHz)231 (94.1 MHz)232 (94.3 MHz)233 (94.5 MHz)234 (94.7 MHz)235 (94.9 MHz)236 (95.1 MHz)237 (95.3 MHz)238 (95.5 MHz)239 (95.7 MHz)240 (95.9 MHz)241 (96.1 MHz)242 (96.3 MHz)243 (96.5 MHz)244 (96.7 MHz)245 (96.9 MHz)246 (97.1 MHz)247 (97.3 MHz)248 (97.5 MHz)249 (97.7 MHz)250 (97.9 MHz)251 (98.1 MHz)252 (98.3 MHz)253 (98.5 MHz)254 (98.7 MHz)255 (98.9 MHz)256 (99.1 MHz)257 (99.3 MHz)258 (99.5 MHz)259 (99.7 MHz)260 (99.9 MHz)261 (100.1 MHz)262 (100.3 MHz)263 (100.5 MHz)264 (100.7 MHz)265 (100.9 MHz)266 (101.1 MHz)267 (101.3 MHz)268 (101.5 MHz)269 (101.7 MHz)270 (101.9 MHz)271 (102.1 MHz)272 (102.3 MHz)273 (102.5 MHz)274 (102.7 MHz)275 (102.9 MHz)276 (103.1 MHz)277 (103.3 MHz)278 (103.5 MHz)279 (103.7 MHz)280 (103.9 MHz)281 (104.1 MHz)282 (104.3 MHz)283 (104.5 MHz)284 (104.7 MHz)285 (104.9 MHz)286 (105.1 MHz)287 (105.3 MHz)288 (105.5 MHz)289 (105.7 MHz)290 (105.9 MHz)291 (106.1 MHz)292 (106.3 MHz)293 (106.5 MHz)294 (106.7 MHz)295 (106.9 MHz)296 (107.1 MHz)297 (107.3 MHz)298 (107.5 MHz)299 (107.7 MHz)300 (107.9 MHz)

Type of antenna elementEPA Type 1: ring-and-stub, or any other type (panels, vertical dipoles...)EPA Type 2: opposed "V" dipoleEPA Type 3: opposed "U" dipoleEPA Type 4: two-piece spiralEPA Type 5: three-piece or four-piece spiral

Height of radiation center

Bay count

Spacing between bays (wavelengths)

Horizontal ERP (kW)

Vertical ERP (kW)

More FM stations on this tower

To skip a station, leave its channel set to "(none)". All heights refer to one tower and are taken from one surface.

Additional station 1

Channel(none)201 (88.1 MHz)202 (88.3 MHz)203 (88.5 MHz)204 (88.7 MHz)205 (88.9 MHz)206 (89.1 MHz)207 (89.3 MHz)208 (89.5 MHz)209 (89.7 MHz)210 (89.9 MHz)211 (90.1 MHz)212 (90.3 MHz)213 (90.5 MHz)214 (90.7 MHz)215 (90.9 MHz)216 (91.1 MHz)217 (91.3 MHz)218 (91.5 MHz)219 (91.7 MHz)220 (91.9 MHz)221 (92.1 MHz)222 (92.3 MHz)223 (92.5 MHz)224 (92.7 MHz)225 (92.9 MHz)226 (93.1 MHz)227 (93.3 MHz)228 (93.5 MHz)229 (93.7 MHz)230 (93.9 MHz)231 (94.1 MHz)232 (94.3 MHz)233 (94.5 MHz)234 (94.7 MHz)235 (94.9 MHz)236 (95.1 MHz)237 (95.3 MHz)238 (95.5 MHz)239 (95.7 MHz)240 (95.9 MHz)241 (96.1 MHz)242 (96.3 MHz)243 (96.5 MHz)244 (96.7 MHz)245 (96.9 MHz)246 (97.1 MHz)247 (97.3 MHz)248 (97.5 MHz)249 (97.7 MHz)250 (97.9 MHz)251 (98.1 MHz)252 (98.3 MHz)253 (98.5 MHz)254 (98.7 MHz)255 (98.9 MHz)256 (99.1 MHz)257 (99.3 MHz)258 (99.5 MHz)259 (99.7 MHz)260 (99.9 MHz)261 (100.1 MHz)262 (100.3 MHz)263 (100.5 MHz)264 (100.7 MHz)265 (100.9 MHz)266 (101.1 MHz)267 (101.3 MHz)268 (101.5 MHz)269 (101.7 MHz)270 (101.9 MHz)271 (102.1 MHz)272 (102.3 MHz)273 (102.5 MHz)274 (102.7 MHz)275 (102.9 MHz)276 (103.1 MHz)277 (103.3 MHz)278 (103.5 MHz)279 (103.7 MHz)280 (103.9 MHz)281 (104.1 MHz)282 (104.3 MHz)283 (104.5 MHz)284 (104.7 MHz)285 (104.9 MHz)286 (105.1 MHz)287 (105.3 MHz)288 (105.5 MHz)289 (105.7 MHz)290 (105.9 MHz)291 (106.1 MHz)292 (106.3 MHz)293 (106.5 MHz)294 (106.7 MHz)295 (106.9 MHz)296 (107.1 MHz)297 (107.3 MHz)298 (107.5 MHz)299 (107.7 MHz)300 (107.9 MHz)

Type of antenna elementEPA Type 1: ring-and-stub, or any other type (panels, vertical dipoles...)EPA Type 2: opposed "V" dipoleEPA Type 3: opposed "U" dipoleEPA Type 4: two-piece spiralEPA Type 5: three-piece or four-piece spiral

Height of radiation center

Bay count

Spacing between bays (wavelengths)

Horizontal ERP (kW)

Vertical ERP (kW)

Additional station 2

Channel(none)201 (88.1 MHz)202 (88.3 MHz)203 (88.5 MHz)204 (88.7 MHz)205 (88.9 MHz)206 (89.1 MHz)207 (89.3 MHz)208 (89.5 MHz)209 (89.7 MHz)210 (89.9 MHz)211 (90.1 MHz)212 (90.3 MHz)213 (90.5 MHz)214 (90.7 MHz)215 (90.9 MHz)216 (91.1 MHz)217 (91.3 MHz)218 (91.5 MHz)219 (91.7 MHz)220 (91.9 MHz)221 (92.1 MHz)222 (92.3 MHz)223 (92.5 MHz)224 (92.7 MHz)225 (92.9 MHz)226 (93.1 MHz)227 (93.3 MHz)228 (93.5 MHz)229 (93.7 MHz)230 (93.9 MHz)231 (94.1 MHz)232 (94.3 MHz)233 (94.5 MHz)234 (94.7 MHz)235 (94.9 MHz)236 (95.1 MHz)237 (95.3 MHz)238 (95.5 MHz)239 (95.7 MHz)240 (95.9 MHz)241 (96.1 MHz)242 (96.3 MHz)243 (96.5 MHz)244 (96.7 MHz)245 (96.9 MHz)246 (97.1 MHz)247 (97.3 MHz)248 (97.5 MHz)249 (97.7 MHz)250 (97.9 MHz)251 (98.1 MHz)252 (98.3 MHz)253 (98.5 MHz)254 (98.7 MHz)255 (98.9 MHz)256 (99.1 MHz)257 (99.3 MHz)258 (99.5 MHz)259 (99.7 MHz)260 (99.9 MHz)261 (100.1 MHz)262 (100.3 MHz)263 (100.5 MHz)264 (100.7 MHz)265 (100.9 MHz)266 (101.1 MHz)267 (101.3 MHz)268 (101.5 MHz)269 (101.7 MHz)270 (101.9 MHz)271 (102.1 MHz)272 (102.3 MHz)273 (102.5 MHz)274 (102.7 MHz)275 (102.9 MHz)276 (103.1 MHz)277 (103.3 MHz)278 (103.5 MHz)279 (103.7 MHz)280 (103.9 MHz)281 (104.1 MHz)282 (104.3 MHz)283 (104.5 MHz)284 (104.7 MHz)285 (104.9 MHz)286 (105.1 MHz)287 (105.3 MHz)288 (105.5 MHz)289 (105.7 MHz)290 (105.9 MHz)291 (106.1 MHz)292 (106.3 MHz)293 (106.5 MHz)294 (106.7 MHz)295 (106.9 MHz)296 (107.1 MHz)297 (107.3 MHz)298 (107.5 MHz)299 (107.7 MHz)300 (107.9 MHz)

Type of antenna elementEPA Type 1: ring-and-stub, or any other type (panels, vertical dipoles...)EPA Type 2: opposed "V" dipoleEPA Type 3: opposed "U" dipoleEPA Type 4: two-piece spiralEPA Type 5: three-piece or four-piece spiral

Height of radiation center

Bay count

Spacing between bays (wavelengths)

Horizontal ERP (kW)

Vertical ERP (kW)

Calculate

Not sure of your antenna's element type?

Antenna models the FCC assigns to every EPA element type, from Appendix B of the OET's Public Notice DA 16-340 (the listing is not an endorsement). Models missing from the list, panels and vertical dipoles among them, count as Type 1.

• Type 1: SWR FM1; Shively 6814, 6810, 6813, 6812; NiCOM BKG88; Harris FMC, FMS; LPC 37CP, 37M, 1105; ERI ECFM, G4CPH, G4CPL, G4CPM; Dielectric DCR-L; BEXT TFC1K
• Type 2: SWR FM3, FM10, FMEC, FMU; Shively 6832; RFS 828; PSI FML; NiCOM BKG77; MCI AT12; Jampro JSLP, JSCP, JMPC, JMCP, JLPC, JLLP, JHPC, JHCP, JCPB; ERI 100A; BEXT TFC2K
• Type 3: Jampro JBCP; Harris FMH, FML, FMP, FMX; DI SHPX, SHP, MPX, MP, LPX, LP; ERI G5CPM, G5CPS; BE BEMP, BESP; Armstrong FMA-737
• Type 4: RFS CPF; Jampro JLCP; Dielectric DCR/HDR-H, DCR/HDR-C, CCA; Armstrong FMA-707/727
• Type 5: Dielectric DCR-Q, DCR/HDR-M, DCR-G

What the calculator does

• A line-by-line translation of the FCC FM Model (OET, Public Notice DA 16-340 of March 31, 2016), and verified against results the FCC itself publishes. It estimates the field 2 m above flat ground from an FM antenna.
• In 1985 the EPA measured five element types (EPA 520/6-85-011), and every bay is modeled as one of them. Bays sit at even spacing about the radiation center fed equal power at equal phase, and each bay's field is summed along its own path. The model applies a fixed ground-reflection factor of 1.6 (2.56 in power terms).
• Null fill and beam tilt. Because the model assumes equal phase, it may show deep nulls that an antenna with tilt or null fill does not actually have. The FCC suggests tracing a line across the peaks of the curve ("connect the dots"); for typical tilt and null-fill settings that line will not understate the field (DA 16-340). Check the box to have the result evaluated against that line.
• Multiple FM stations sharing a tower. At each point their power densities sum, and every FM station is held to one common limit. Where the combined level exceeds it, the table lists which stations share responsibility (47 CFR 1.1307(b)(5)(i)). Other services on that tower, such as TV and cellular, use different antennas and limits; only FM is covered here.
• Rooftop sites. Take heights from the roof surface and the results apply to people on the roof. The FCC warns that the model can be inaccurate near rooftops and for antennas mounted close to the surface; take measurements in those cases.
• For 30-300 MHz, Table 1 of 47 CFR 1.1310(e)(1) sets the limits. General population: 0.2 mW/cm², or 200 µW/cm². Trained workers inside controlled areas: 1.0 mW/cm², or 1,000 µW/cm².

Official FCC version: FM Model.

A planning aid only. The FCC did not produce it, and it is no substitute for measurements where those are required.