Whip antenna
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A whip antenna is an antenna consisting of a straight flexible wire or rod. The bottom end of the whip is connected to the radio receiver or transmitter. A whip antenna is a form of monopole antenna.
Retractable whip antenna on portable FM radio receiver
Whip antenna on car
Firefighter using a handheld (walkie-talkie) with a whip antenna
A rubber ducky antenna, a common type of electrically short whip, on a handheld UHF CB transceiver. With rubber sheath (left) removed.
Halo antenna
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A halo antenna, or halo, is a center-fed 1 /2 wavelength dipole antenna, which has been bent into a circle, with a break directly opposite the feed point. The dipole's ends are close, but do not to
Radiation patterns for a large (left) and a small (right) loop antenna. The light grey square and octagonal rims represent the antenna wires. Colors represent signal strength: magenta and red are "hot" directions of intense signal; blue and indigo are "cold" or low or weak signal; black is no signal. A halo is similar to the right figure, but instead of indigo and black, the center of a halo would be mostly blue: A weak, but non-zero signal.
Car roof-mounted 6 meter halo antenna for mobile amateur radio (by WA8FJW). Note the triple-loop.