The AM BCB band is unique in that it is virtually never limited by noise; rather every channel has deep layers of QRM to deal with. The BCB is very useful as a sanity check for beverages, because they are still very directional in the BCB. If I have a broken beverage, the directionality will be off and/or signals will be down. None of this guarantees that the beverage will actually hear weak signals better than some other antenna. For that, I use WWV/WWVH on 2.5 MHz. I can compare signal to noise ratios of antennas to be tested. I make sure that my tuned loops can tuned to 2.5 MHz.
Rick N6RK _________________ Topband Reflector Archives - http://www.contesting.com/_topband