[Amps] question for you experts - RF choke on antenna to ground

[John Lyles]

Medium Wave broacasters usually have a big RF choke to ground on their output, installed in the ATU, especially for series fed towers. It is typically called the 'static drain' and sold by Harris, LBA, Kintronics and others manufacturers. These chokes are made from 
fairly heavy magnet wire, 18 AWG or better, solenoidal style on a large diameter form. Without them, a lot of the current crop of solid state transmitters will kick off when thunderclouds build up due to the voltage induced on the output feeder. 
Back when tubes were used, of course, these chokes doubled as a safety choke for failed blocking capacitors. 

I usually install quarter wave coaxial stubs on VHF and UHF transmitters that don't change channels much, as a lightning/static protection device for monopole antennas, esp in New Mexico in rural installations. Its for same reason. 
73
John 
K5PRO