ANTENNA GAIN INFLUENCE ON
EFFECTIVE RADIATED POWER

Compliments of Firestik® Antenna Company Technical Support Team

Copyright © 1996 Firestik® Antenna Company

A radio's transmitting power can be concentrated along the horizon by use of a GAIN antenna. Although you may still be transmitting with four watts of power, your EFFECTIVE RADIATED POWER (ERP) will be greatly increased. This table shows the effects of antenna gain on a transmitter with 4 watts of transmit power.

Antenna Gain dB Watt Multiplier 4 Watt ERP
1 1.2 4.8
2 1.6 6.4
3 2.1 8.4
4 2.5 10.0
5 3.2 12.8
6 4.0 16.0
7 5.1 20.4
8 6.3 25.2
9 8.0 32.0
10 10.2 40.8
11 12.6 50.4
12 15.9 63.6
13 20.0 80.0
14 25.1 100.4
15 31.6 126.4
16 39.9 159.6
17 50.2 200.8
18 63.3 253.2
19 79.5 318.0
20 100.0 400.0


Firestik Antenna Company - (Tel) 602-273-7151 - www.firestik.com

Updated 2023.12.07

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