Greg, thanks for the reply. i do in fact have the adapter you are referring to, but it made no difference. i have the little cable (blue in my case) hooked up to the 12v power connection (tried both constant and ignition sense). I will try hooking it up to the blue wire you mention - i didn't use the extension cable (to keep my wires to a minimum) so that wire isn't present. regardless, i was providing power, so it should have worked. interestingly, when it did work, i had decent reception with no antenna plugged in and even better with just the antenna adapter plugged in (but no power applied, and not actually connected to the antenna - just sort of hanging there).
see my threads at http://empeg.comms.net/php/showflat.php?Cat=&Board=empeg_tech&Number=156887&page=0&view=collapsed&sb=5&o=0&fpart= about the tuner and http://empeg.comms.net/php/showflat.php?Cat=&Board=install&Number=156884&page=0&view=collapsed&sb=5&o=0&fpart= about the standby issue.

my problem in standby is not that it stays on, but that it cuts off completely. the wiring harness was reversed - but i fixed that. are you in austin?