n m o has been around for years, since I first started selling two way
back in 1970. I sold larson antennas for years. n m o was probably the
most popular as it was used by Motorola and others. It took a 3 quarter
inch hole in the roof. I used antenna specialist, but didn't really like
them much. They used a 3/8 hole and this was similar to larson's n l a
mount which is what I used until Larson discontinued them.
73s
Butch Bussen
wa0vjr