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2. Whip antenna - Wikipedia

   en.wikipedia.org/wiki/Whip_antenna

   The length of a whip antenna is determined by the wavelength of the radio waves it is used with. Their length varies from compact electrically short antennas ⁠ 1 / 10 ⁠ wavelength long, up to ⁠ 5 / 8 ⁠ wavelength to improve directivity. The most common type is the quarter-wave whip, which is approximately ⁠ 1 / 4 ⁠ wavelength long.

3. Monopole antenna - Wikipedia

   en.wikipedia.org/wiki/Monopole_antenna

   Due to their omnidirectional radiation pattern, vertical monopole antennas are commonly used in terrestrial radio communication systems in which the direction to the transmitter or receiver is unknown or constantly changing, [7] such as broadcasting, mobile two-way radios, and wireless devices like cellphones and Wi-fi networks, [8] [4] because they radiate equal radio power in all horizontal ...

4. Antenna types - Wikipedia

   en.wikipedia.org/wiki/Antenna_types

   [2] Quarter-wave monopole The most common monopole is a vertical, ⁠ 1 / 4 ⁠ wave tall, which is the minimum size for it to self-resonate. [o] A one-quarter wave monopole has a gain of 5.12 dBi when mounted over a good ground plane.

5. Antenna (radio) - Wikipedia

   en.wikipedia.org/wiki/Antenna_(radio)

   For instance, if a radio wave passing a given location has a flux of 1 pW / m 2 (10 −12 Watts per square meter) and an antenna has an effective area of 12 m 2, then the antenna would deliver 12 pW of RF power to the receiver (30 microvolts RMS at 75 ohms). Since the receiving antenna is not equally sensitive to signals received from all ...

6. Mast radiator - Wikipedia

   en.wikipedia.org/wiki/Mast_radiator

   An ideal monopole antenna radiates maximum power in horizontal directions at a height of 225 electrical degrees, about ⁠ 5 / 8 ⁠ or 0.625 of a wavelength (this is an approximation valid for a typical finite thickness mast; for an infinitely thin mast the maximum occurs at / = 0.637 [6]) As shown in the diagram, at heights below a half ...

7. J-pole antenna - Wikipedia

   en.wikipedia.org/wiki/J-pole_antenna

   The J-pole antenna is an end-fed omnidirectional half-wave antenna that is matched to the feedline by a shorted quarter-wave parallel transmission line stub. [5] [1] [6] For a transmitting antenna to operate efficiently, absorbing all the power provided by its feedline, the antenna must be impedance matched to the line; it must have a resistance equal to the feedline's characteristic impedance.