Thanks Oliver, very clear.

73 with gratitude
Everett

"F8BOE" wrote in message
...
Hello,

On 2m/70cm some antennas work better when you use a mag mount (Sirio
HP2070 for example) because they are tuned to be used with a mag mount:
added parasitic capacity between bottom of the mount and the car's steel.
Expected you do not drive a 'vette or an Audi...

For lower frequencies it's better to drill holes or to properly ground the
antenna to the car, as most mag mounts are not wider than a sq foot and
you would quickly be annoyed by the potential differencies between the
car's ground and the antenna ground, resulting in HF re-entry problems as
your antenna will be then antenna + coax cable and all the hassles of bad
and/or variable SWR.

73 de F8BOE Olivier ...-.-