Not familiar with the AMT unit. My Audio Technica wireless has a gain control on both the transmitter and receiver, so you could try adjusting them to test your theory it was picking up the rest of the band. (also be careful of smart phones like Blackberry, they can interfere with wireless, but they usually make an awful noise when doing so)
Is the Shure wireless as well or wired? if wireless check to see if those frequencies are competing with the AMT.
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