Antenna plus Metal roof

#1
I am curious as to how high above my metal roof do I need to be?
I built an 8 legged ground plane, and I don't want it to high, I know the higher the better. But I need to be stealth.

Terry
 

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ab cd

Senior Member
#2
Antenna should see horizon all around. If roof is higher than antenna, view is blocked, hence antenna will not pick planes in the direction of blockage.

roof-R.png

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#6
Signals penetrate through non-reflective (unglazed) glass windows with little attenuation. Very strong signals of nearby planes penetrate through walls also.

Metal completely blocks the signal.
concrete? non-metal roof? so it will good to put the antenna in the attic?
 

ab cd

Senior Member
#7
concrete? non-metal roof? so it will good to put the antenna in the attic?
All building contruction material attenuate the signal, some less, some more. The attenuation depends on both the type of material and thickness of material. Metal completely blocks the signal.

The best antenna location is outdoor in clear, zero attenuation.

Attic will have moderate attenuation. If one cannot install over roof or mast, and antenna has to be indoors, then attic is a good indoor location.

Another good indoor location is near a large glass window in the outer wall.
 
#8
Hi...i am a new user here. As per my knowledge Antenna should see horizon all around. If roof is higher than antenna, view is blocked, hence antenna will not pick planes in the direction of blockage.Signals penetrate through non-reflective glass windows with little attenuation. Very strong signals of nearby planes penetrate through walls also.

small volume pcb assembly
 
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