Question: Sweet spot

Fringe Reception

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There's nothing better than using a spectrum analyzer but here's a website you might find interesting. Selecting and Siting your TV aerial: Measuring Signal Quality - The Poor man's DTT meter

Using his method, I compared several antennas, one at a time, on the same mast and the same height. It can help you find signal strengths but it cannot seperate clean signals from noisy signals, and a low-level clean signal always wins over a noisy high-level signal.