67 antenna question?

The antennas that I`ve got on both my 67 and 68 have the same base as GTGrinly`s but the mast is a really long telescopic version. I`ve always understood that the solid masts were used in conjunction with the FM radios while the telescopic masts were used with AM radios. Mullinax, I`ve seen the repro antennas on Ebay complete for $125.00, so it pays to shop around.

Thanks.

I'll check around.