Spacing Between US Stations

The table below lists spacing requirements between US FM stations based on FCC 73.207 rule.

Spacing Between US Stations
Relation Co-Channel (Same Frequency) 200 kHz (1st Adjacent Channel) 400 or 600 kHz (2nd or 3rd Adjacent Channel)
A - A 115 km 72 km 31 km
A - B1 143 km 96 km 48 km
A - B 178 km 113 km 69 km
A - C3 142 km 89 km 42 km
A - C2 166 km 106 km 55 km
A - C1 200 km 133 km 75 km
A - C0 215 km 152 km 86 km
A - C 266 km 165 km 95 km
B1 - B1 175 km 114 km 50 km
B1 - B 211 km 145 km 71 km
B1 - C3 175 km 114 km 50 km
B1 - C2 200 km 134 km 56 km
B1 - C1 233 km 161 km 77 km
B1 - C0 248 km 180 km 87 km
B1 - C 259 km 193 km 105 km
B - B 241 km 169 km 74 km
B - C3 211 km 145 km 71 km
B - C2 241 km 169 km 74 km
B - C1 270 km 195 km 79 km
B - C0 272 km 214 km 89 km
B - C 274 km 217 km 105 km
C3 - C3 153 km 99 km 43 km
C3 - C2 177 km 117 km 56 km
C3 - C1 211 km 144 km 76 km
C3 - C0 226 km 163 km 87 km
C3 - C 237 km 176 km 96 km
C2 - C2 190 km 130 km 58 km
C2 - C1 224 km 158 km 79 km
C2 - C0 239 km 176 km 89 km
C2 - C 249 km 188 km 105 km
C1 - C1 245 km 177 km 82 km
C1 - C0 259 km 196 km 94 km
C1 - C 270 km 209 km 105 km
C0 - C0 270 km 207 km 96 km
C0 - C 281 km 220 km 105 km
C - C 290 km 241 km 105 km

FM stations within 320 km of the Canadian and Mexican borders must meet additional spacing requirements with respect to foreign stations, see Canadian Border Zone Spacing and Mexican Border Zone Spacing

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