I just drilled a bunch in one of mine...Typical ball mount, with
four holes total. "One big"...And being the cab is double wall,
I also had to drill holes inside the cab wall also.. That one is
almost at roof top level, at the base... I have a camper on that
truck, "actually both of mine do", and installing an antenna is a
PIA. I'm not overly keen on bumper mounts, except that they do
often allow a long lower mast..The hang is much of that lower mast
is up against my tailgate, and camper back. Not really good...
I decided I only live once, and go for broke.
It's up on the cab, on the drivers side pillar behind my head.
The higher bands work a good bit better there, than the bumper...
It's a tree whacker though...Thats why I always mount on the drivers
side...You have a better chance of getting the "gap" between branches,
when driving down a street. So far, with the little amount I've used
it, it seems to be browning the food. I was on 75m one night, and got
a 20 over 9 from one guy about 200 miles away, with my usual 100w.
Yes, s meter reading doesn't really mean much, but it does indicate
it's
workin...It wasn't that late in the evening either, which was a good
sign.
Usually, for a mobile on 75m, the later it gets, the better in general.

Long haul for sure...In the early PM, when it's mainly up/down NVIS,
a mobile can be the pits compared to the dipoles...But they usually
wake up later when the lower angles started working better..
MK