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				Simple rule of thumb: If it doesn't work in the attic, try it outside.
			
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 Can't tell you how many times I have to tell customers that!
The horizontal beam width of the C4 varies from about 31° at channel 14 to around 45° at 51.  That's side to side, not center to each side for the -3 dB (half-power) points.
GroundUrmast is giving you the same advice I'd give if you called in.