Thank you everyone for your points of view. After thought and review of your comments I will have the mast dropped and radar maounted in that fashion. For those that asked, I do have an internal conduit for wires but no internal halyards and I have 2 retrieval lines already in place, one to the top of the mast and the other midway up where the old radome was mounted. I thought this would be a quick and easy install, but I can see different now. Thanks again for all the input.
If you have a conduit with a messenger and there is enough room in the conduit to run the radar cable you can certainly do the job without pulling the stick.
That doesn't mean that it wouldn't be easier, safer and perhaps even less expensive to pull it and do it on the ground.
There are lots of variables and unfortunately, you only find those variables when you are in the middle of the job.
I think you have made the best choice. Like Maine says, there is always other things you can do while you have the mast down.
Plus, assuming that you are having the work done, you will be able to check out the workmanship yourself with the mast down.
I had to chuckle at the quick and easy comment too.