Amateur radio antennas must not be a hazard to aircraft, so the FCC and the Federal Aviation Administration (FAA) limit the height of an antenna structure to a maximum value. Towers may exceed this maximum value only with formal notification to the FAA and registration with the FCC. A height of feet or even higher will provide even more advantages for long-distance communications. To a distant receiving station, a transmitting antenna at feet will provide the effect of approximately 8 to 10 times more transmitting power than the same antenna at 35 feet.
Jun 07, · This all depends on what you want to do with the antenna and operating. Want it for local/regional communications? Want it for DX? Do you want the antenna to be omni directional or do you want it to favor a certain direction (e.g. Europe)? All that has to factor in when it comes to the height and direction of the wire. To calculate range for an antenna such as the KB9VBR J-Pole antenna, you can use this simple equation to determine antenna’s receiving range over a flat surface: range in miles = square root of height X An antenna mounted at 30 feet should have a theoretical range of miles.
Antenna installation guide Attic installation Antenna alignment Antenna height The height of an antenna has a major impact on its performance. Aspects including the feed impedance, radiation diagram, radiation losses, distance from interference, reduction in possibility of . The angle of radiation can be so low that most of the signal is eaten up by ground loss. For the 21MHz, 24MHz and 28MHz bands, an antenna on a 30m/98ft high tower has a radiation pattern of 5 degrees or less (depending on ground conditions, the electrical height .