[roybto]

At GroundUrMast's suggestion, I looked at slightly higher antenna heights for the tvfool calculation. I discovered that by going over about 22 ft. AGL, the weakest station of interest (RF33 near 121 degrees) suddenly goes from 1Edge to LOS. At the same time, RF33 NM value increases by more than 20 dB to become comparable to the weaker LOS stations from Seattle (at 290 degrees), in the 40+ dB range.

In reality, the elevation database (averaged over 100-meter squares, as ADTech has said) probably understates my elevation. I'm not on the top of the hill, but the downward slope increases pretty abruptly just to the northwest of my location. The RF 33 signal seems not significantly weaker than those 40+ dB LOS stations, so I think I'm getting LOS or close to it on RF 33 anyway.

The best antenna for me might be one with two lobes 180 degrees apart. In other words, some gain but a near zero front-to-back ratio. (Maybe one with a driven element in the middle, directors out both ends, and no reflector?) It might also be nice if RF 9 and RF 11 could be received.

Any suggestions for an antenna?

Thanks,
--Roybto