Dipole Antenna Calculator

The measurements below are for building a simple Dipole Antenna. The Wire Size can range from 16 AWG to 12 AWG. The larger the wire, the wider the bandwidth. The antenna is designed to be fed with 50 or 75 Ohm Coax Cable of most any length with a Balun. Place a 1:1 Balun on the Antenna end of the Feedline. The Balun matches the Balanced Antenna into the Unbalanced Coax Cable. The balun will keep stray antenna currents off of the Feedline and help to keep stray RF out of the Radio Shack. If a Ferrite Balun is used, the balun needs to be rated at least twice the operating wattage to prevent the balun from overheating. This will help mitigate mismatches and stray RF due to using the antenna at frequencies other than what the antenna was specifically designed for.

Calculator
Frequency:  MHz

Please note: The calculations are approximate, so some final length adjustment may be necessary. Dimensions will change slightly due to antenna height and ground conductivity variations...and Keep The Antenna Away From Power Lines. They are good at turning you into "The Squirrel in the Substation".

Antenna Diagram

Amateur Bands
160 Meters

MHz "L" (Feet) "E" (Feet)
1.800 260.00 130.00
1.900 246.32 123.16
2.000 234.00 117.00
80 Meters

3.500 133.71 66.86
3.600 130.00 65.00
3.700 126.49 63.24
3.800 123.16 61.58
3.900 120.00 60.00
4.000 117.00 58.50
60 Meters

5.331 87.80 43.90
5.347 87.53 43.77
5.367 87.21 43.60
5.371 87.13 43.56
5.404 86.61 43.31
40 Meters

7.000 66.86 33.43
7.100 65.92 32.96
7.150 65.45 32.73
7.200 65.00 32.50
7.300 64.11 32.05
30 Meters

10.100 46.34 23.17
10.150 46.11 23.05
20 Meters

14.000 33.43 16.71
14.100 33.19 16.60
14.200 32.96 16.48
14.220 32.91 16.46
14.300 32.73 16.36
14.313 32.70 16.35
17 Meters

18.068 25.90 12.95
18.130 25.81 12.91
15 Meters

21.000 22.29 11.14
21.100 22.18 11.09
21.200 22.08 11.04
21.300 21.97 10.99
12 Meters

24.890 18.80 9.40
24.950 18.76 9.38
10 Meters

28.000 16.71 8.36
28.500 16.42 8.21
29.000 16.14 8.07
29.500 15.86 7.93