"Dave Platt" wrote in message
...
In article ,

Take a look at

http://wwwcf.fhwa.dot.gov/legsregs/d...pg/0625sup.htm


Thanks, Dave, for the exact reference sites. They were helpful. And thanks
to all the others for their replies.

I think it's clear that finding one number-- one right answer-- is
difficult. I just called the California Highway Patrol office in Altadena
and found that there really is no right answer. The guy at the front desk
said that the "consensus" in the office was 14 feet. And of course he was
speaking only for California. He said that there's no separate regulation
for antennas, only the number for total vehicle height. There seems to be no
urgency on the part of the CHP to refer to a vehicle code to enforce the
height.

As you saw, the replies to my post ranged from 12.5 to 14 feet. It surprises
me that the standard deviation implied by this spread is that large.

All in all, this has been very surprising.

Thinking about it some more, perhaps the limiting factor becomes not bridges
and overpasses, but fast food drive-thrus and gas station roofs.