I bought a 280SL with replaced fenders and no antenna, but cabling for the original was left. However, I opted for a somewhat later Hirshmann, where the antenna looks like the original with only 4 tall sections, but the motor is more modern. It cost about $200 from the oldest car radio specialist in the city. The Senior mechanic still had the bore templates for the Pagoda, and was real happy to do the job for me for a low cost.
/Lennart
280SL 1968, manual German spec