Traffic Receiver Antenna
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 TomTom Mini USB Traffic Receiver Traffic Receiver Antenna Charger 4UUC00101 $10.75 Time Remaining: 15d 4h 51m Buy It Now for only: $10.75 |
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 Original Garmin GTM 25 TMC Antenna FM Traffic Receiver + Car Charger Power cable $10.50 (3 Bids) Time Remaining: 3d 1h 1m |
 TomTom Micro USB LT Traffic Receiver Car Charger VIA 1500 1505 adapter TMC 1535 $28.93 Time Remaining: 26d 21h 42m Buy It Now for only: $28.93 |
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 Original Garmin GTM 25 TMC Antenna FM Traffic Receiver + Car Charger Power cable $24.48 Time Remaining: 13h 39m Buy It Now for only: $24.48 |
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 Original Garmin GTM 25 TMC Antenna FM Traffic Receiver + Car Charger Power cable $6.90 (2 Bids) Time Remaining: 3d 7h 37m |
 TomTom RDS TMC Traffic Receiver GO 510 720 910 ONE XL $19.99 Time Remaining: 16d 5h 32m Buy It Now for only: $19.99 |
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 Original Garmin GTM 25 TMC Antenna FM Traffic Receiver + Car Charger Power cable $7.90 Time Remaining: 3d 8h 31m Buy It Now for only: $8.98 |
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 Original Garmin GTM 25 TMC Antenna FM Traffic Receiver + Car Charger Power cable $6.90 Time Remaining: 3d 8h 45m Buy It Now for only: $8.98 |
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 Original Garmin GTM 25 TMC Antenna FM Traffic Receiver + Car Charger Power cable $6.90 Time Remaining: 3d 23h 42m Buy It Now for only: $8.84 |
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 Garmin GTM 25 GTM25 TMC Traffic Receiver W Lifetime Traffic Antenna Adapter $33.95 Time Remaining: 20d 21h 52m Buy It Now for only: $33.95 |
 OEM Magellan Roadmate 1440 1210 1340 Traffic Receiver Car Charger AXRDS1SXXUC $19.88 Time Remaining: 20d 22h 23m Buy It Now for only: $19.88 |
 TomTom Micro USB Traffic Receiver Car Charger VIA 1500 1505 1535 1400 1405 1435 $1.25 (2 Bids) Time Remaining: 4d 2h 51m |
 NEW TomTom Mini USB LT Traffic Receiver Car Charger ONE XL XLS 4th 130 140 RDS $27.75 Time Remaining: 19d 1h 28m Buy It Now for only: $27.75 |
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 TomTom USB LIFETIME TRAFFIC Receiver GPS ONE 150 140S 135 130S 125 140 130 TMC $2.83 (5 Bids) Time Remaining: 4d 3h 36m |
 TomTom GO 710 720 RDS TMC UK EUROPE Traffic Receiver $20.82 Time Remaining: 12d 5h 4m Buy It Now for only: $20.82 |
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 Original Garmin GTM 25 TMC Antenna FM Traffic Receiver + Car Charger Power cable $6.90 Time Remaining: 4d 5h 35m Buy It Now for only: $8.84 |
 NMEA GPS TMC Antenna Traffic Receiver Develop Module $16.97 Time Remaining: 25d 14h 49m Buy It Now for only: $16.97 |
 NEW TomTom Mini USB LT Traffic Receiver Car Charger XL 325S 330S 340S 350 335 s $27.75 Time Remaining: 15d 18h 29m Buy It Now for only: $27.75 |
 Original Garmin GTM 25 TMC Antenna FM Traffic Receiver + Car Charger Power cable $6.90 Time Remaining: 4d 17h 30m Buy It Now for only: $8.98 |
 TomTom USB LIFETIME TRAFFIC Receiver GPS XXL 530S 535T 540T 550T 550TM 550M 540M $22.54 Time Remaining: 15d 18h 30m Buy It Now for only: $22.54 |
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 Original Garmin GTM 25 TMC Antenna FM Traffic Receiver + Car Charger Power cable $6.90 Time Remaining: 5d 36m Buy It Now for only: $8.84 |
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 Original Garmin GTM 25 TMC Antenna FM Traffic Receiver + Car Charger Power cable $24.80 Time Remaining: 13h 35m Buy It Now for only: $24.80 |
 TomTom USB LIFETIME TRAFFIC Receiver GPS XXL 530S 535T 540T 550T 550TM 550M 540M $0.99 (1 Bid) Time Remaining: 5d 3h 36m |
 Royaltek GPS RDS TMC Traffic Receiver Builder Module $12.99 Time Remaining: 22d 13h 37m Buy It Now for only: $12.99 |
 Official Magellan Maestro 4700 FREE LIFETIME Traffic Receiver Link Car Adapter $18.88 Time Remaining: 10d 23h 48m Buy It Now for only: $18.88 |
 Original Garmin GTM 25 TMC Antenna FM Traffic Receiver + Car Charger Power cable $6.90 Time Remaining: 5d 17h 17m Buy It Now for only: $8.84 |
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 Garmin GTM 25 FM TMC Traffic Receiver antenna Charger $32.98 Time Remaining: 21d 1h 8m Buy It Now for only: $32.98 |
 Panasonic TMC Traffic Receiver CY TM200U for Strada GPS $6.99 Time Remaining: 5d 21h 46m |
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 NMEA 0183 GPS RDS TMC Traffic Receiver Develop Module $16.99 Time Remaining: 27d 9h Buy It Now for only: $16.99 |
 TomTom USB LIFETIME TRAFFIC Receiver GPS XL 350 340S 335 330S 325S 340 330 325 $0.99 Time Remaining: 6d 3h 36m |
 TomTom USB LIFETIME TRAFFIC Receiver GPS ONE 150 140S 130S 125 140 130 TMC 135 $22.52 Time Remaining: 26d 21h 46m Buy It Now for only: $22.52 |
 NMEA GPS TMC Antenna Traffic Receiver Develop Module $16.97 Time Remaining: 18d 15h 7m Buy It Now for only: $16.97 |
 Original Garmin GTM 25 TMC Antenna FM Traffic Receiver + Car Charger Power cable $6.90 Time Remaining: 6d 5h 56m Buy It Now for only: $8.84 |
 1X Royaltek GPS RDS TMC Traffic Receiver Develop Module $16.99 Time Remaining: 11d 6h 24m Buy It Now for only: $16.99 |
 OEM Magellan Roadmate 1210 1340 1440 Traffic Receiver Car Charger AXRDS1SXXUC $18.88 Time Remaining: 4d 3h 56m Buy It Now for only: $18.88 |
 Original Garmin GTM 25 TMC Antenna FM Traffic Receiver + Car Charger Power cable $6.90 Time Remaining: 6d 14h 35m Buy It Now for only: $8.84 |
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Antenna height considerations
Longwave/Low frequency antennas
At VLF, LF and MF the radio mast or tower is often used directly as an antenna. Its height determines the vertical radiation pattern. Masts and towers with heights around a quarter wave or shorter, radiate considerable power towards the sky. This allows only a small area of fade-free reception at night, because the distance at which groundwave and skywave are of comparable strength and can interfere with each other is severely restricted (approximately 40 kilometres to 200 kilometres from the transmission site, depending on frequency and ground conductivity).
For high power transmitters, masts with heights of about half the radiated wavelength are preferred because they concentrate the radiated power toward the horizon. This enlarges the distance at which selective fading occurs. However, masts with heights of around half a wavelength are much more expensive than shorter ones and often too expensive for lower power mediumwave stations.
For longwave transmitters, however, the construction of halfwave masts is infeasible in most cases, either for economic reasons or because of problems with flight safety. The only radio mast for longwave with a height of half a wavelength built to date was the Warsaw Radio Mast (which did not survive). For frequencies lower than the longwave range, masts have to be electrically enlarged by base loading coils or structures on the top, because the heights required for masts of even a quarter wavelength are too large to realize physically.
Use is not normally made of masts higher than five-eighths (5/8) of a wavelength, because such masts (except for some special constructions for high power mediumwave broadcasting) exhibit poor vertical radiation patterns. The heights of masts for mediumwave transmitters normally do not exceed the 300 metre (1000 foot) level.
Sometimes cage aerials or longwire aerials are used for LF and MF transmission. In this case the height of the tower may be greater than is usually the case. Because towers or masts used for cage or long wire aerials are grounded at the base, they are especially suitable for supporting antennas for UHF or VHF broadcasting.
Shortwave/High frequency antennas
For transmissions in the shortwave range, mast height has no influence on efficiency when the masts are used for supporting the antenna. Normally, shortwave transmitters do not use masts higher than 100 metres.
Antennas for UHF/VHF
For transmissions in the VHF and UHF range, tower importance and value can vary depending on the area to be served. The cost of a tower must be re-couped primarily through advertising carried on the broadcasts, especially where there are no license fees charged the listener. Considerations such as population density, line-of-sight signal range (affected by terrain), and the costs of tower construction and maintenance versus height, must all be weighed in choosing an ideal tower size. Often there are restrictions related to flight safety governing maximum allowable tower height. Two shorter towers may be a better option then a single taller tower. Also, a higher tower might not be useful if the signal is blocked by terrain or if all the listeners are in a concentrated area and a higher tower cannot pay for itself.
Antennas for point-to-point radio services
In most applications line-of-sight is required between the transmitting and receiving antennas for point-to-point services, and antennas may have to be mounted at a certain height about ground. For microwave radio systems, it is not always possible to use long transmission lines between transmitter and antenna, so towers with equipment rooms or cabinets close to the height of the antenna may be required.
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