What you want to do is not point it at the nearest site, but rather point it in such a way that it only picks up ONE site, and attenuates the others. This minimizes the multipath effect (i.e. duplicate signals arriving at the scanner slightly out of phase with one another) that causes the dropouts.
Been meaning to build a yagi myself, but keep getting preoccupied with other things on weekends. Let us know how it goes.
-AZ
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