What is the purpose for coiling wire antennas?

I wonder why some antennas are wound and others …. Is there any explanation the benefits of having a wire spiral antenna instead of cable striaight

Winding inductance increases, but also reduces the length of the antenna. It has side effects that are not desirable (which is why not all of the antenna coil. However, in the lowest frequency (longest wavelength) at times shorter the antenna is the only one who can use and well tolerated disadvantages. In general, the best antenna is the total length.

Directional Antennas

Raymarine Raymarine 4kw Open Array with 4′ Antenna $3,479.25

RAYMARINE 37STV/37 STV SATELLITE TV ANTENNA E93017 NEW $2,859.00

RAYMARINE 37STV/37 STV SATELLITE TV ANTENNA E93017 NEW $2,843.00

FURUNO FS-1503 SSB W/ ANTENNA TUNER FS1503 BRAND NEW $2,169.00

Sea-King 15″ Satellite TV Antenna 1200-KU $1,879.88

NAVICO LOWRANCE BR 24 GPS ANTENNA BROADBAND RADAR DOME $1,799.99

NAVICO LOWRANCE BR-24 GPS ANTENNA BROADBAND RADAR $1,799.99

HUMMINBIRD 998C SI COMBO w/antenna+ducer. New 407760-1 $1,769.95

40 J-mount $14.41 40″ J-Mount…

XM Satellite Radio Car Antenna $14.95 *Ultra-compact satellite radio antenna *Mounts magnetically to any vehicle *Aerodynamic design – less than 1/2″ tall…

Small Portable AM/FM Shortwave Radio $44.99 Finally, there is a compact radio that delivers high quality reception, the CCRadio AM/FM/Shortwave Pocket Radio. AM reception is considered best in class for any radio this size and both FM and Shortwave reception are exceptional as well. Moving from band to band and searching for stations has been made easy with the combined use of a “Favorites” button and turning the tuning knob. A large lighte…

Lift Your Skinny Fists Like Antennas to Heaven $10.89 Canada’s Godspeed You Black Emperor raise the ante on their already ambitious orchestral rock by releasing a double CD of material as their second full-length album. The group combines the drums and guitar of typical rock-band instrumentation with horns and strings to create a music built around drones and slowly evolving melodic figures. It rises and falls from delicate introductory passages to u…

Too Soon for Flowers $9.73 The Dry Spells, a San Francisco-based female-led ensemble, creates a unique sound drawing from traditional folk ballads of lost loves, unimaginable sorrows, and nostalgia for a forgotten past, charged with an array of electric and acoustic instrumentation and intricate vocal harmonies. The band, made up of past and current members of SFs critically lauded retro-prog-psych transcendentalist outfit …

Antenna $13.98 …