On 11/21/2020 8:54 AM, Eric Greenwell wrote:
...

In general, I would expect the signal strength from nearby gliders (+/-
500'vertically, 1000' horizontally) in a gaggle to overwhelm all but the
very worst antenna placement.


Good point. Receivers can be very sensitive. Years ago GPS receivers
were finicky, had to put them outdoors for 15 minutes to get a fix, etc.
Nowadays those in recent model cellphones work just fine on the
passenger seat of a metal-body car. Note that the GPS satellites are
generally low on the horizon. And very far away. Presumably the
signals come in through windows and bounce around inside the car. No
idea if the FLARM receivers are comparably sensitive. Nor whether
carbon fiber reflects radio waves as well as sheet metal does.