1993 Mercedes 190-E 2.6L car with 129,000 miles - The old Cell phone power goes off & on for no reason. I try to turn it off and it comes back on, now my antenna goes up & down as well when the car is on and off. The cell phone problem happened a few years back and I was able to garage the car and the problem pretty much went away. Now the car is outside again (getting rained on) and the problem is even worse (can't turn off the phone even if I hit the power off and the Antenna issue is new) than before. I've taken out the fuse until I can resolve the problem. Any suggestions would be appreciated. Thanks

Cut the wire to the old factory cell and use a modern one?

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Not many of those old analog trunk mounted cell phone units out there. It does sound like you'd need to replace the Hirschman antenna unit, which are pretty pricey these days.