Well, I spent about an hour going through the truck to decide on a good spot. It was a bit too thick to put in the drivers kick panel, didn't want to ziptie it anywhere and have it rattle. Could have put it under the seat, but seems like a waste of time and effort to mount it there because its small and could go somewhere else. One day when I pick up a couple amps I'll probably put them under the seat because that will be the only place they'll fit. I chose the glove box, because I already have a really slick install of a kca-420i adapter mounted to the plate that covers my steering column. Knee panel? Don't know what you call it. Placing it in the glove box allowed me to keep the existing location of the KCA-420i, where putting it under the seat probably would have made me relocate wires.

I will add though, if I were to route the antenna to the top of the truck, I probably would have placed it in the back somewhere.