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2. Power antenna - Wikipedia

   en.wikipedia.org/wiki/Power_antenna

   A power antenna is an electrically motorized automotive radio antenna that raises and lowers either manually with a dash-mounted switch or automatically by turning the radio on or off. The automatic kind will also lower when the ignition switch is turned off.

3. Effective radiated power - Wikipedia

   en.wikipedia.org/wiki/Effective_radiated_power

   The transmitter power that would have to be applied to the isotropic antenna to radiate this much power is the EIRP. Effective radiated power (ERP), synonymous with equivalent radiated power, is an IEEE standardized definition of directional radio frequency (RF) power, such as that emitted by a radio transmitter.

4. Antenna (radio) - Wikipedia

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

   The antenna gain, or power gain of an antenna is defined as the ratio of the intensity (power per unit surface area) radiated by the antenna in the direction of its maximum output, at an arbitrary distance, divided by the intensity radiated at the same distance by a hypothetical isotropic antenna which radiates equal power in all directions.

5. Gain (antenna) - Wikipedia

   en.wikipedia.org/wiki/Gain_(antenna)

   A transmitting antenna is supplied with power by a transmission line connecting the antenna to a radio transmitter. The power accepted by the antenna is the power supplied to the antenna's terminals. Losses prior to the antenna terminals are accounted for by separate impedance mismatch factors which are therefore not included in the calculation ...

6. Antenna types - Wikipedia

   en.wikipedia.org/wiki/Antenna_types

   An isotropic antenna radiates equal power in all three dimensions, while an omnidirectional antenna radiates equal power in all horizontal directions, but little or none vertically. An omnidirectional antenna's radiated power varies with elevation angle: Maximum in the horizontal, and diminishing as the azimuth rises to align with the antenna's ...

7. Radiation resistance - Wikipedia

   en.wikipedia.org/wiki/Radiation_resistance

   To transfer maximum power to the antenna, the transmitter and feedline must be impedance matched to the antenna. This means the feedline must present to the antenna a resistance equal to the input resistance and a reactance (capacitance or inductance) equal but opposite to the antenna's reactance. If these impedances are not matched, the ...