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Do trees affect the UHF OTA signal for HD?

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Old 11-30-2005, 04:03 PM   #1
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Default Do trees affect the UHF OTA signal for HD?

My suggested antenna pointing map has the antenna right into a stand of trees although there is some open space.......is this a problem? The antenna I ordered on recommendation from a Solidsignal tech is :

Antennas Direct DB4 Multi-Directional HDTV Antenna

zip code: 98110
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Old 11-30-2005, 04:05 PM   #2
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Default Yes, it will

The effect will be more pronounced in the spring, when the leaves are on the trees. And, it depends on how strong your signal is. But, UHF signals are affected by trees, buildings, just about anything. This is why the VHF frequencies are usually the preferred method for TV broadcasting.
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Old 11-30-2005, 04:39 PM   #3
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Originally Posted by mwkbear
The effect will be more pronounced in the spring, when the leaves are on the trees. And, it depends on how strong your signal is. But, UHF signals are affected by trees, buildings, just about anything. This is why the VHF frequencies are usually the preferred method for TV broadcasting.
So..have I gotten the wrong antenna? I can point it away from the fir trees into some open sky but it will not be exactly as the map is indicating it should be pointed...
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Old 12-01-2005, 12:19 AM   #4
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VHF preferred? Unlikely...

Leaves don't affect broadcast signals much, they're much more interfering with Sat signals - which are impeded by water since Sat is in the microwave range. Point as per map, then wiggle to find best actual position.
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Old 12-01-2005, 06:22 AM   #5
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Quote:
Originally Posted by RSawdey
VHF preferred? Unlikely...

Leaves don't affect broadcast signals much, they're much more interfering with Sat signals - which are impeded by water since Sat is in the microwave range. Point as per map, then wiggle to find best actual position.
No, he's right in general. UHF will be more affected by trees than VHF. Just like with Sat signals, the higher in frequency you go the more trees will have an affect.
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Old 12-01-2005, 08:17 AM   #6
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Quote:
Originally Posted by RSawdey
VHF preferred? Unlikely...

Leaves don't affect broadcast signals much, they're much more interfering with Sat signals - which are impeded by water since Sat is in the microwave range. Point as per map, then wiggle to find best actual position.
VHF signals carry much farther and are less affected by multipath from trees and buildings. This is due to the lower frequencies. It's the same with AM and FM radio. AM travels farther because it's broadcast over a lower frequency, and the lower frequencies can bounce off the atmosphere, and will tend to follow the curve of the Earth a bit more than the higher ones. Ever hear of a 50,000 watt clear-channel FM station?

This is why all the major networks in large metro areas are on VHF and not UHF. The digital channels will eventually be switching back to the VHF band when the country goes all digital (sometime this century..)

As far as the original question, your best bet is to get the best UHF antenna with the most gain, and point it where it needs to point. If your incoming signal is strong enough, the trees shouldn't be too much of an issue.
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Old 12-01-2005, 09:17 AM   #7
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Quote:
Originally Posted by mwkbear
VHF signals carry much farther and are less affected by multipath from trees and buildings. This is due to the lower frequencies. It's the same with AM and FM radio. AM travels farther because it's broadcast over a lower frequency, and the lower frequencies can bounce off the atmosphere, and will tend to follow the curve of the Earth a bit more than the higher ones. Ever hear of a 50,000 watt clear-channel FM station?

This is why all the major networks in large metro areas are on VHF and not UHF. The digital channels will eventually be switching back to the VHF band when the country goes all digital (sometime this century..)

As far as the original question, your best bet is to get the best UHF antenna with the most gain, and point it where it needs to point. If your incoming signal is strong enough, the trees shouldn't be too much of an issue.
Thanks...I will give it a try... Question though about the difference in AM and FM radio signals....Why is it that when you go into a tunnel or overhang in the car the AM always cuts out..but FM stays clear? It seems that AM is more affected by obstructions (?)
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Old 12-01-2005, 03:19 PM   #8
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It all depends on the tunnel. In New York City tunnels you can get clear reception on AM, FM, and even on cellphones.

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