Very High Frequency (VHF) Antenna Installation
Very High Frequency (VHF) antennas are the TV aerials which are basically used to spot the radio waves that are usually transmitted in very high frequency bandwidth of the electromagnetic scale. The term “VHF” refers to electromagnetic waves that range between the frequency level of 30 to 300 MHz or, likewise, electromagnetic waves with an orientation of one to 10 meters. Normally, VHF antennas are used in air direction-finding, air traffic control, and even for catching up some analog TV channels. In some places, VHF is also used to broadcast digital television signals as well.
The different types of VHF Antennas are given below:
- TV Dipole Antennas: These types of antennas are popularly known as rabbit ears antennas. TV dipole antennas are placed on the top of the television sets and capable of receiving very high frequency signals. It basically consists of a base with two telescopic metal poles clinging out from it. Sometimes TV dipole antennas also come with a ring, which enables the uncovering of Ultra High Frequency (UHF) signals.
- Folded Dipole Antennas: Folded dipole antennas are used to capture FM signals in the VHF range. A folded dipole antenna is flattened “C” shape TV aerial.
- Whip Antennas: Whip antennas are quite simple and familiar type of antennas that mainly consists of a single whip-like metal rod.
- Yagi-Uda Antennas: Named after its discoverers, Hidetsugo Yagi and Shintaro Uda from Tohoku, the Yagi-Uda antenna constitutes of a central beam with three perpendicular cross pieces. Yagi-Uda antennas are used comprehensively for the reception of both VHF and UHF airwaves. Generally, they are directional antennas and so need to be placed in the direction where the signal broadcaster is nearby so that it can work effectively.
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