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2. Radio masts and towers - Wikipedia

   en.wikipedia.org/wiki/Radio_masts_and_towers

   A mast radiator or mast antenna is a radio tower or mast in which the whole structure is an antenna. Mast antennas are the transmitting antennas typical for long or medium wave broadcasting. Structurally, the only difference is that some mast radiators require the mast base to be insulated from the ground.

3. Mast radiator - Wikipedia

   en.wikipedia.org/wiki/Mast_radiator

   The RF current density in the earth, and thus the power loss per square meter, increases the closer one gets to the ground terminal at the base of the mast, [16] so the radial ground system can be thought of as replacing the soil with a higher conductivity medium, copper, in the parts of the ground carrying high current density, to reduce power ...

4. Tower Mounted Amplifier - Wikipedia

   en.wikipedia.org/wiki/Tower_Mounted_Amplifier

   A Tower Mounted Amplifier (TMA), or Mast Head Amplifier (MHA), is a low-noise amplifier (LNA) mounted as close as practical to the antenna in mobile masts or base transceiver stations. A TMA reduces the base transceiver station noise figure (NF) and therefore improves its overall sensitivity ; in other words the mobile mast is able to receive ...

5. Monopole antenna - Wikipedia

   en.wikipedia.org/wiki/Monopole_antenna

   For monopole antennas operating at lower frequencies, below 20 MHz, the ground plane is usually the Earth; in this case the antenna is a vertical mast mounted on the ground on an insulator to isolate it electrically from the ground. One side of the feedline is connected to the mast and the other to an Earth ground at the base of the antenna. In ...

6. T-antenna - Wikipedia

   en.wikipedia.org/wiki/T-antenna

   So at low frequencies, even a 'T'-antenna can have very low radiation resistance, often less than 1 ohm, [5] [11] so the efficiency is limited by other resistances in the antenna and the ground system. The input power is divided between the radiation resistance and the 'ohmic' resistances of the antenna+ground circuit, chiefly the coil and the ...

7. Antenna types - Wikipedia

   en.wikipedia.org/wiki/Antenna_types

   The wires outline the shape of the letter 'T', hence the name. The dangling wire may run directly into the back of a radio, but more often a 'T' antenna is fed by a cable attached near where the dangling wire comes to ground. Additionally, the antenna requires a low resistance ground system, normally centered directly below the bottom of the 'T ...