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2. Folded unipole antenna - Wikipedia

   en.wikipedia.org/wiki/Folded_unipole_antenna

   A possible improvement over the basic folded-unipole antenna is the "self resonant" unipole antenna, described in U.S. patent 6,133,890. [ d ] Another possible improvement to the folded unipole is described in U.S. patent 4,658,266 , which concerns a more carefully designed form of ground plane for use with all monopole types (only incidentally ...

3. 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.

4. List of catastrophic collapses of broadcast masts and towers

   en.wikipedia.org/wiki/List_of_catastrophic...

   1078 feet HAAT. Erected in 1981. No definitive cause ever found for collapse. Speculation was that the collapse was directly or indirectly related to the recent installation of their digital television antenna. The collapse destroyed the tower, KLTV's analog and digital antennas, KLTV's digital transmitter, and FM station KVNE's antenna. The ...

5. Antenna types - Wikipedia

   en.wikipedia.org/wiki/Antenna_types

   Inevitably some antennas won't conveniently fit into any one basic type, so the last section on real antennas is an "everything else" category for a few peculiar antennas that don't fit cleanly into any of the categories or subcategories used in this article; for example, random wire antennas and antennas that are laid down on the ground ...

6. Counterpoise (ground system) - Wikipedia

   en.wikipedia.org/wiki/Counterpoise_(ground_system)

   Counterpoises are typically used in antenna systems for radio transmitters where a good earth ground connection cannot be constructed.. Monopole antennas used at low frequencies, below 3 MHz, such as the mast radiator antennas used for AM broadcasting, require the radio transmitter to be electrically connected to the Earth under the antenna; this is called a ground (or earth).

7. Turnstile antenna - Wikipedia

   en.wikipedia.org/wiki/Turnstile_antenna

   A turnstile antenna, or crossed-dipole antenna, [1] is a radio antenna consisting of a set of two identical dipole antennas mounted at right angles to each other and fed in phase quadrature; the two currents applied to the dipoles are 90° out of phase. [2] [3] The name reflects the notion the antenna looks like a turnstile when mounted ...