Quote:
Originally Posted by jeffing
House is 20 feet tall with steel roof, I assume need antenna at least 40 feet tall
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Forgot to mention... You should probably play around with the Interactive Maps tool (link is
here). This lets you play around with antenna height and see how much it affects the signal strength from each station.
My initial gut feel is that you probably won't see that much difference between 20 feet and 40 feet. Height can make a big difference if your biggest obstruction is a very close-in (within a mile) tall hill or building. However, in you case, there doesn't appear to be any big terrain obstructions to cause this kind of problem.
Experiment with different heights and see how much of a difference it makes. If the difference is negligible, then a rooftop install at 20 feet is probably going to perform about the same as a tower install at 40 feet.