If you are fortunate enough to operate from the summit of a hill or mountain where Mother Earth provides the altitude, that works, too. Higher is always better, whether that means putting the antenna on a flagpole, tower or a rooftop. Height is critical to the performance of all antennas at VHF and UHF frequencies. Common omnidirectional antenna designs for base stations include ground planes, loops and J-poles, but there are others.Īn omnidirectional antenna spreads your signal over a broad area, depending on how high you install it. Omnidirectional antennas are also found in base stations where the goal is to transmit and receive from any direction with minimal hassle and expense. Instead, the omnidirectional mobile antenna blasts your signal in all directions so that you’ll stand a decent chance of communicating no matter where you are driving. This makes sense because it is impractical to stop and point your car in the direction of the station you want to contact. All commonly used mobile antennas are omnidirectional. This type of VHF antenna transmits and receives in all directions at once (the same is true of the dipoles, loops and vertical antennas for HF use). The main differences are that VHF/UHF antennas are smaller and the losses caused by poor feed lines and elevated SWRs (or both) are more critical. 2 VHF/UHF Antennas for the VHF and UHF bands are similar in many ways to HF antennas.
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