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Yeah I see I left out a few words . What I was using as a coil form was a piece broom stick. It varies a little but lets call it an inch (22mm) Starting at the bottom wind 2 1/4 turns close wound now you need a 1/2 inch gap between 2 and 3 for the tap to the coax center connector. Now continue...

I am sure this is old but This works well to repair older antenna Take a bit of 12 ga. solid wire and wind a coil tightly upon it tapped 2 and 1/4 turns up from the bottom. At this tap connect the center of your coax The shield and the ground planes connect at the 2 and 1/4 dowm end and the and...

You might look at the audio output transformer. The output is center tapped half is your speaker/PA half modulates the radio.

Perhaps he might try a zener on his cathode so it is easier to drive?