We wired the Voyager to the power line to the reading light above the twin bed curb side in the Classic. We installed a switch with a LED to show the power was on. As soon as I turn on the dash mounted truck display, it connects to the camera on the back of the trailer which is just above the "Airstream" word and has just the stock 5" or 6" antenna.
We wired the 23D camera to the USB power socket above the bed with a similar switch and power on LED. Have an immediate lock to the display on the dash of the Mercedes using the stock camera antenna.
In both installations, the Voyager signal is being generated next to the trailer skin with the rear window glass perhaps a foot lower. The truck has a camper shell and rear cab glass for the signal to get through while the Mercedes just has the rear glass.
Maybe the newer systems have much less "RF" power?
WBCCI Life Member 5123, AIR 70341, 4CU, WD9EMC
TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell
2014 31' Classic model 30 twin beds, 50 amp service, 900 watt solar system, Centramatics, Dill TPMS, disc brakes, 16" tires & wheels