Quote:
Originally Posted by GroundUrMast
The strip-line type balun used on many of the AD UHF antennas will tend to be close to a short circuit in the L-VHF band. I wouldn't expect much VHF signal will pass the stock balun on the DB(n)E antennas or the 91XG.
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I think you might be right, the PCB balun must be tuned (and thus more efficient) for the UHF band and not pass VHF signals. The antennas that I've used this trick on all had the toroid balun which is just a coupling transformer. The PCB balun looks like it might even have tuning stubs to block out-of-band signals but I'm not familiar with the design.