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Antenna Wire Lengths

Calculated lengths for improvised wire antennas.

AntennaWireLength

Calculated lengths for improvised wire antennas. Lengths are calculated to be at the middle point of either the digital or voice portion of the band. Actual final antenna length may need to be up to 5% less depending on material used and mounting location / orientation.

BandDigital ¼ WaveDigital ½ WaveVoice ¼ WaveVoice ½ Wave
GMRSN/AN/A0’ 6.03”1’ 0.05”
70cm0’ 6.44”1’ 0.89”0’ 6.44”1’ 0.89”
1.25m1’ 0.54”2’ 1.08”1’ 0.54”2’ 1.08”
MURSN/AN/A1’ 6.54”3’ 1.08”
2m1’ 7.20”3’ 2.40”1’ 7.20”3’ 2.40”
6m4’ 5.91”8’ 11.81”4’ 5.91”8’ 11.81”
10m8’ 3.58”16’ 7.16”8’ 0.66”16’ 1.32”
CBN/AN/A8’ 7.11”17’ 2.23”
12m9’ 4.53”18’ 9.06”9’ 4.31”18’ 8.61”
15m11’ 0.77”22’ 1.55”10’ 11.22”21’ 10.44”
17m12’ 10.97”25’ 9.93”12’ 10.54”25’ 9.08”
20m16’ 6.98”33’ 1.97”16’ 4.20”32’ 8.40”
30m23’ 0.86”46’ 1.71”N/AN/A
40m33’ 0.21”66’ 0.42”32’ 3.31”64’ 6.62”
80m65’ 6.86”131’ 1.71”59’ 10.76”119’ 9.52”
160m128’ 2.94”256’ 5.87”121’ 6.85”243’ 1.69”