The power antenna on my '91 560 SEC does not work at all. Below the unit is a green/yellow oily mixture which I am assuming escaped from the unit. I have priced a new unit (approx. $211 Canadian). Are there any alternatives? Is there an aftermarket unit that would work well here? If there is a unit does anyone have advice on the wiring (current unit uses a four prong plug connection)?

I have great faith in this forum. My last problem was resolved in part using the advice from other members.