You'd likely do best to simply remove the reflectors (carefully drill out the rivets, use standard #10 hardware to reinstall, if needed) rather than to try to aim individual panels in opposite directions. Doing so will make the antenna purely bi-directional (although at slightly lower gain, about 2-3 dB) on UHF. The drawback might be that whatever coincidental VHF reception you're currently getting might have to be addressed separately.
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Is there a handheld signal strength meter I can get at a reasonable cost
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How much is reasonable? You can usually score a working Sencore 1454 on ebay for under $300 if you're patient. Impatience will usually cost you $600 for which you can usually get a working Sencore 1476CM.