I recently replaced the vhf antenna on my 2011 R27. The antenna was okay, my problem was the cable that was kinked between the antenna and cabin top. I chose to replace the antenna and cable as the easiest solution. The cable entered the cabin and snaked down the column over the sink with the rest of the wiring coming down from the top. Granted the fridge had to be removed to snake the cable to the compartment behind the helm and put a new connector on the cable.
The difficult part was getting the cable through the cabin top and finding it in the wire race without removing all the trim and monkey fur. I should have hired one of the junior sailors around the club with smaller more flexible arms for that part.