Quote:
Originally Posted by middleofnowhere
my old antenna had the UHF dipoles on it, the really short ones? anyway, won't VHF dipoles work with UHF with a slight signal decrease? ...
|
No. A VHF antenna may pull-in a UHF signal, but the signal decrease will be substantial. There are many ways to design an antenna, but the size of the elements is closely related to the wavelength of the electromagnetic wave that carries the signal. Many antennas are designed around quarter-wave elements--the length of the element is one-fourth the wavelength of the signal to be received. For certain specialized applications, an antenna may be designed to receive a single channel. Because UHF waves are substantially shorter than VHF waves, UHF antennas tend to be substantially different in design than VHF antennas. Look at any TV antenna. If it is VHF-only, then it will have a clearly different design than a UHF-only antenna. If it is VHF-UHF, then you can see clearly the differences between the UHF and VHF sections.