Looked at our local McDonald's, 9 foot drive thru.
After that I Thought, hmm, I'll bet there are internet references. Yup, 9' is the fast food standard BUT I saw a few warnings where some were lower.
Parking structure can be 7' but need to closer to 8' for handicapped conversion van parking spaces/entrances.
So, with 9' I can use a 4'. My forward bed side height is 55", so that's 4', 7". I rarely go in parking structures so I can keep a wrench handy to pull the antenna in those rare cases.
My yard sale special CB is a Radio Shack unit made by who knows.
Edit: OK, eBaying the 4' Firestik in red and the bed stake mount and a 12' connecting cable.
