1) " Vhf" -- As it applies to Vhf Antennas Very high frequency (VHF) is the radio frequency range from30 MHz (wavelength 10 m ) to 300 MHz (wavelength 1 m ). Common uses for VHF are FM radio broadcast at 88-108 MHz and television broadcast (together with UHF ). VHF is also commonly used for terrestrial navigation systems ( VOR in particular) and aircraft communications. The general description of frequencies immediately below VHF is HF,and the next higher frequencies are known as Ultra highfrequency (UHF). UHF and VHF are the most common frequency bands for television. VHF frequencies' propagation characteristics are ideal for short-distance terrestrial communication, with a range generallysomewhat farther than line-of-sight from the transmitter (see formula below). Unlike high frequencies (HF), the ionosphere doesnot usually reflect VHF radio and thus transmissions are restricted to the local area (and don't interfere with transmissionsthousands of kilometres away). VHF is also less affected by atmospheric noise and interference from electrical equipment than lowfrequencies. Whilst it is more easily blocked by land features than HF and lower frequencies, it is less bothered by buildingsand other less substantial objects than higher frequencies.Two unusual propagation conditions can allow much farther range than normal. The first, tropospheric ducting, can occur infront of and parallel to an advancing cold weather front, especially if there is a marked difference in humidities between thecold and warm air masses. A duct can form approximately 150 miles (240 km.) in advance of the cold front, much like a ventilationduct in a building, and VHF radio frequencies can travel along inside the duct, bending or refracting, for hundreds of miles. Forexample, a 50-watt Amateur FM transmitter at 146 MHz can talk from Chicago IL to Joplin MO directly, and to Austin TX through arepeater. The second type, much more rare, is called Sporadic-E, referring to the E-laye...
2) " Antennas" -- As it applies to Vhf Antennas In biology, antenna (plural: antennae) refers to the sensing organs of several arthropods.In electronics, antenna (plural: antennas) refers to the component designed to send and receive radio waves. Antenna, also known as ANT1, is a Greek-language terrestrial channel.In astronomy, Antennae is the name of two colliding galaxies NGC 4038 and NGC 4039. ...
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