You need a ground and permanent (fused!!) power, preferable direct from the battery. The remote power to the amplifier can be gotten from the back of the radio, the remote power to the antenna or the first amplifier (whatever the easiest way may be).

I have one powered antenna and three amplifiers connected to the remote power coming from the radio unit...

greetingz,

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1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)