Sorry for the repost, but this is the one I considered using in my house to broadcast my music to inside and outside radios:

http://www.themindfactory.com/Products/DDT-1_FM/ddt-1_fm.html

This is the same guy that was building these a long time ago, but I thought I remembered him trying to build a "portable" battery-powered version of this some time ago....maybe im nuts

ED7
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ED7 --------------------- 20G Mark2A SN#: 010101680 1997 Chrysler Sebring LXi