Transmitter with a 150 Watt power output, SWR = 20: 1, 0 dB gain antenna. This antenna system has a performance / performance is worse compared to an FM transmitter with a power output of 25 Watt, SWR = 1: 1, and 6 dB gain antenna. This example shows how great the influence of the antenna system to the transmission of radio signals.
An important factor in the FM antenna system installation is the antenna height. In the VHF band, the requirement that communication can take place is a LOS (Line Of Sight). So ideally communications on VHF, both receiver and transmitter antennas both should be mutually visible. So that between them there should be no objects that can absorb radio energy. So that the amateur radio in the VHF band is often stated that it is better to have a small but gain antenna mounted antenna with a gain higher than a large but low mounted.
Vertical antenna 5 / 8 lambda below are very easy to make, and quite inexpensive. To "tune" enough lengthen or shorten pecutnya (whip). On the connections that can be mounted clamps tightened. These clamps are sold at auto parts store or motorcycle.
Loading Coil can use a single electric wire of 1.2 mm HIS and need not be discarded insulation. After the match, in each and every screw and give the loading coil with waterproof glue (again on a motorcycle parts store).
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