No matter what UHF antenna you use there will be some break up due to the tall pines.
You can minimize the problem if you set your or a new UHF antenna in a tripod mount and move it across your roof to find your best location. I think that the best antenna for you would be a 2 bay UHF aimed to 45 degrees magnetic. You will find this antenna at Antennas Direct or Pro Brand Intl.
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