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The RS 15-024 FM trap is actually a decent product. The price is hard to beat too. It's not adjustable, it just attenuates the entire FM broadcast band.
The Winegard FT7600 is a premium grade product with better weather resistance and it is adjustable. You'll want to have an FM receiver with signal strength meter... You need to be able to adjust the FT7600 while checking to see that the the unit is tuned to suppress the particular FM signal that causes you trouble.
23° is fine as a starting aim point... you'll want to check left and right of that point while checking results on a good TV (one with a signal quality meter makes fine tuning antenna aim easier).
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