ATAS100 mag mount tips - parked car

"Roy Ashkenaz roya-b4T0evRm615ZmPDBg+/6q1aTQe2KTcn/@public.gmane.org [FT100]" <[email protected]>
Newsgroups gmane.recreation.radio.hardware.yaesu.ft100
Message-ID <[email protected]>
 Do I need an external ground when using an ATAS 100 to a magnetic mount on to a parked car? Any other suggestions or tips?
Thanks, Roy K2RMA
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