Yes, Definitely drill the holeI have that antenna on two of my vehicles with the mag. Thinking about drilling the hole on one of them. I have been looking at this one:
Sirio Telflon RG303 Coax Cable (4 meter) -- 2000 Watts [rg303] - $42.00 : Sirio Antenna, High Performance Antenna Made in ItalySirio Antenna Sirio Telflon RG303 Coax Cable (4 meter) -- 2000 Watts [rg303] - Sirio Telflon Coax RG303, 4 meters, for max 2000 Watts, to use with Sirio Turbo-5000 and Performer-5000.www.sirio.store
I think it is the correct mount, but it looks like it is missing something?
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