39 radio antenna

[30-9]

Hi Gents

I have a stock antenna (on the roof) on my 39. I want to remove just the rod and leave the base, on the roof. I removed the (what I think is) set screw. However the rod will not pull out.

What’s the trick. I see no other screws. There is a spot on opposite side where another set screw may have been but it appears to be missing.