aydanrogers - Thanks for putting that pic up with your UHF aerial mount - I copied your idea and mounted in the same place yesterday:
I didn't bother screwing it into anywhere (yet) as I'll be unplugging it & putting it into the centre console during the week and plugging it in on weekends when driving around.
Also thinking of eventually putting a fuse box in behind the glove box to power other things - but that is all in due course