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Thinking out loud...
Are the YA1713's stacked one on top of the other? (Or side by side?)
KOAM and KHQA are both strong enough co-channel interference sources to present a problem. Side by side stacking can produce a more narrow horizontal beam-width which would be desirable, as a means of rejecting the interfering signals.
Use of a reversed splitter (CC7870) as a combiner comes at the cost of about 3 dB. You still get the modified beam-width though. A pair of Antennacraft Y10713 with their 300 ohm outputs would lend themselves to combining via 1/4 (or 3/4) wave long sections of 450 ohm ladder line, thus less combining loss.
I think your consideration of the combo antennas is a viable option also. But you'll need to find an antenna with at least 3 or more dB additional gain to expect much difference.
I think the solution is going to be a combination of gain and interference rejection.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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Last edited by GroundUrMast; 1-May-2011 at 8:10 PM.
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