AVS Forum Special Member
Join Date: Nov 2001
Location: College Park, MD
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The station you are having trouble with, 59.X, really broadcasts on UHF channel 43. I wouldn't expect you to be having an intermodulation problem if you are not using a preamplifier, and even if you did have an intermodulation problem, it would be much more likely to disrupt your weaker signals whereas 59.X/43 is one of your three strongest.
Most likely, you are just experiencing an unfortuitous multipath bounce, where the direct signal path from 59.X/43 and the reflected signal are close enough to one another in strength to cause a cancellation problem. A different antenna can make things worse or better, but since they are already bad, any change in reception characteristics is more likely to help than hurt.
The Clearstream 2-V appears to have a VHF highband dipole, which is better at receiving network channels 7 and 9 from 30 miles away than your DIY bowtie, and it has a UHF reflector, which tends to reduce back signals while only slightly increasing gain. Does your DIY antenna have a reflector on it? You ordinarily benefit from a reflector, but in your case, the introduction of a reflector if you don't already have one would be a crap shoot, since it would be tending to further weaken the direct path signal component.
You might do better moving your antenna to another spot on the roof. Is that practical? If it is on a tripod, it is very easy to move it a few feet at a time and plot its reception quality and then plant it in the center of the best performance range, if you find a good one.