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thanks guys . funny you mention the wire in the imax ..... every time someone mentions how broad banded they are it always makes me think about how larger diameter elements are said to be more broad-banded than smaller diameter ones , but i think i read somewhere that the matching system in the imax is the cause of that broad banded ability , the same one that's lossy and causes noise and the same one that allows it to work well for some folks without typical ground elements . and i'm back at all antennas are compromises , some more obvious than others .