Some years ago I read a magazine article on modifying a base-loaded CB
magnetic mount antenna for lower bands. These antennas have a coaxial
mount -- the bottom of the coil is grounded and the feed connection is
made to a tap on the coil. By rewinding the loading coil (more turns of
smaller wire) and properly connecting the tap you can get an antenna
that is resonant and provides a good match -- as I recall, the article
described doing this for bands as low as 40 meters.

I made one that worked well on 15 meters. I know it's not as efficient
as a bigger antenna, but it is easy to put it on a car roof for casual
operation and you can go under bridges that you'd have to detour around
with a full size antenna.

Does anyone remember this, can anyone send me a reference, or, better,
a photocopy of the article? It was probably in 73, it could also have
been in CQ or Ham Radio. Somewhere along the way I decided I just
couldn't save all my old magazines, they are all long gone mow.

73, Al, N1AW