Thanks for the information about your antenna. Are you using a preamp? If yes, which one?
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when I raised it up on the tower I got many more channels (so reception is very height sensitive). Maybe it just needs to be a bit higher to get KIRO - who knows?
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KIRO doesn't look any better at 75 feet using the same V9Z 0S7 location that I used above:
http://www.tvfool.com/?option=com_wr...513476e051baf4
or 100
http://www.tvfool.com/?option=com_wr...5134492ef6f856
However, the wavefront from the transmitter is not uniform, so a small change in height or location might find a signal hot spot.
I don't have your exact location. Can you try reports at different heights using the interactive map browser by placing the cursor at your antenna location using this:
http://www.tvfool.com/index.php?opti...pper&Itemid=90
Keep in mind that the report is only a computer simulation, and is known to be less accurate with 2Edge signals. You are already doing better than predicted, because the lower limit is NM -15 dB, which is the noise floor. Signals weaker than that are buried in the noise and can not be recovered.
If you want to experiment with no guarantee of improvement, there are several things you can try in addition to more height.
If you are not using a preamp, you can add one. If you are using a preamp, you can switch to one with a lower noise figure.
You can use a UHF antenna with more gain than the UHF section of the Stacker, and combine it with the Stacker with a UVSJ. The Stacker would then be only for VHF-High, real channels 7-13.
The Antennas Direct 91XG has a gain of about 15.5 dBi for channel 39. It also has a tilt feature that allows you to raise the front of the antenna to intercept signals coming in from higher elevations. Calaveras has a horizontal stack of two 91XGs, giving him an additional 2.5 dB over one:
http://www.aa6g.org/DTV/index.html
The current champ for UHF gain (16.5 dBi for channel 39) is the Antennas Direct DB8e with both panels aimed in the same direction.