I have been flying from inside my truck for the past few weeks. I don't have a special antenna setup. I park facing the direction I intend to fly, hook the controller on the steering wheel via the handle, sit the bird next to the vehicle, and away she goes. This works amazingly well & I can't tell any difference in range from inside the truck vs. outside the truck, which makes sense as the glass should be transparent to the 2.4 Ghz signal. What I find even more amazing is how much control range I get to the sides & even rear through the cab & body panels. The comfort & built-in cup holder is a nice feature also!
I am not a supporter of strict VLOS flight recommendations. I've been flying RC for nearly 40 years. In a bright sky, beyond a few hundred feet, you cannot see a Phantom. You certainly can't determine its orientation. VLOS RC rules are relics of an era when we had no telemetry or FPV available. You had
NO CHOICE but to fly VLOS until recently. We have far more information, control, & safety features flying a Phantom via FPV than were ever available flying an old-school fixed-wing RC via VLOS. Even the FAA is coming to realize this and there are discussions about revamping the VLOS recommendation considering the features available in modern-day RC aircraft.
I certainly see NO DIFFERENCE in flying sitting in a vehicle through the glass
(even with an external antenna) vs. standing next to the car. When flying beyond VLOS
(which I do on EVERY flight) I don't see the harm in flying from within a house. JMHO.