On Nov 3, 5:54 pm, "John Doe" wrote:
If you can't contribute anything positive to this question, then stay out of
it, with your trash!

I have a 10m base loaded mag mount antenna, that I had to put a piece of
felt over the magnet as not to scratch a new vehicle.

When I did this I apparently changed the capacitance between the mag mount
and the roof of the vehicle. Someone suggested that I might want to replace
the felt with either a large balloon or a large prophylactic as it is
thinner and the capacitance would then return to almost where it should be.

Positive comments only!

Lose the magmount and drill a hole in your roof. When you sale your
truck put a rbber plug in it made for that pupose. Has 0 effect on
your resale value.

John

Nobody seems to have mentioned these...

- Tune the antenna length to allow for the change in capacitance?
- Increase the diameter of the magnet to increase the capacitance...

Cheers Bob

John Doe wrote:

I have a 10m base loaded mag mount antenna, that I had to put a piece of
felt over the magnet as not to scratch a new vehicle.

"John Doe" wrote in message
...
If you can't contribute anything positive to this question, then stay out
of it, with your trash!

I have a 10m base loaded mag mount antenna, that I had to put a piece of
felt over the magnet as not to scratch a new vehicle.

When I did this I apparently changed the capacitance between the mag mount
and the roof of the vehicle. Someone suggested that I might want to
replace the felt with either a large balloon or a large prophylactic as it
is thinner and the capacitance would then return to almost where it should
be.

Positive comments only!



Maybe black, electrical tape on the bottom of the mag mount (applied to that
mag mount, of course.) Would be thinner, but I suspect it might still cause
some problems with increased capacitance. Count paint that mag mount base
with liquid electrical tape, which I get at my local ACE Hardware store.
But then, you could still get some grit underneath the mount. Saran Wrap?
Very thin. Might be your best bet. Tough and flexible. Maybe that would
help...

Good luck.

Dave

On Nov 3, 5:54 pm, "John Doe" wrote:
If you can't contribute anything positive to this question, then stay out of
it, with your trash!

I have a 10m base loaded mag mount antenna, that I had to put a piece of
felt over the magnet as not to scratch a new vehicle.

When I did this I apparently changed the capacitance between the mag mount
and the roof of the vehicle. Someone suggested that I might want to replace
the felt with either a large balloon or a large prophylactic as it is
thinner and the capacitance would then return to almost where it should be.

Positive comments only!

Consider drilling an NMO mount and get the Larsen whip for 27-30 MHz.

Can't Drill any holes - but thanks for the suggestion.

wrote in message
oups.com...
On Nov 3, 5:54 pm, "John Doe" wrote:
If you can't contribute anything positive to this question, then stay out
of
it, with your trash!

I have a 10m base loaded mag mount antenna, that I had to put a piece of
felt over the magnet as not to scratch a new vehicle.

When I did this I apparently changed the capacitance between the mag
mount
and the roof of the vehicle. Someone suggested that I might want to
replace
the felt with either a large balloon or a large prophylactic as it is
thinner and the capacitance would then return to almost where it should
be.

Positive comments only!

Consider drilling an NMO mount and get the Larsen whip for 27-30 MHz.

On Nov 3, 1:54 pm, "John Doe" wrote:
If you can't contribute anything positive to this question, then stay out of
it, with your trash!

I have a 10m base loaded mag mount antenna, that I had to put a piece of
felt over the magnet as not to scratch a new vehicle.

When I did this I apparently changed the capacitance between the mag mount
and the roof of the vehicle. Someone suggested that I might want to replace
the felt with either a large balloon or a large prophylactic as it is
thinner and the capacitance would then return to almost where it should be.

Positive comments only!

Just use a very thin piece of plastic. Some companies that make mag-
mounts sell circular pieces with adhesive to stick to the antenna
base. But you can just cut out a disk from a zip-lock bag and put
underneath the magnet. It won't slip around.
The thicker the material, the more it affects the performance because
it reduces the capacitance to the metal that the antenna is placed on.
Thinner is better here.
By the way, someone told me to try felt years ago, and I did. The
antenna had more tendency to slip around, and it DID mar the paint on
my car, more than if I hadn't used anything.
Last comment: a balloon would probably get water in it, and keep the
antenna base wet for a long time after it rains (at least here in
Portland where I live!) Not a great idea. And balloons aren't known
for their tougness.
Gary

ah well it was nice while it lasted
"John Doe" wrote in message
...
If you can't contribute anything positive to this question, then stay out
of it, with your trash!

I have a 10m base loaded mag mount antenna, that I had to put a piece of
felt over the magnet as not to scratch a new vehicle.

When I did this I apparently changed the capacitance between the mag mount
and the roof of the vehicle. Someone suggested that I might want to
replace the felt with either a large balloon or a large prophylactic as it
is thinner and the capacitance would then return to almost where it should
be.

Positive comments only!

too bad the topic dies
"John Doe" wrote in message
...
If you can't contribute anything positive to this question, then stay out
of it, with your trash!

I have a 10m base loaded mag mount antenna, that I had to put a piece of
felt over the magnet as not to scratch a new vehicle.

When I did this I apparently changed the capacitance between the mag mount
and the roof of the vehicle. Someone suggested that I might want to
replace the felt with either a large balloon or a large prophylactic as it
is thinner and the capacitance would then return to almost where it should
be.

Positive comments only!