maybe it has to do with the aftermarket head units not telling the antenna to go down.

When you shut the key off of the stock system, the antenna goes down, so in theory, you set up the aftermarket head unit to do the same, but I bet it has to do with the fact that the aftermarket headunit never stops sending voltage.

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg