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I believe it is Shango 66 who has a good video on youtube on making VHF transmit antennas for blonder tongue agile modulators (an optimal transmit antenna is also an optimal receive antenna). You could probably build a better one your self than you could buy. Thicker diameter wire gives better band width, and if you make a folded dipole you can use a 300-75ohm matching transformer to better match it to your coax connection lead. You would probably need to make 2 dipoles (one for each of the tricky channels), but that should be a better option than an indoor multichannel antenna.
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