I wish Scamp
wouldn't use foil on their bubblewrap insulation. The foil really reduces radio wave power. That's why some folks wear tin foil hats. Look up Faraday Cage.
Automobile makers put their radio antennas outside the vehicle for a reason. Even my DW can be seen holding her cell phone near the car's windows
when reception gets iffy. I expect an external antenna would be a good idea in a Scamp
or any metal RV too.
And don't get me started on Scamp's silly R-15 claims. Reflective surfaces do resist heat transfer but really need a ¾ inch air gap to be effective, something not present in our trailers. They should use the white (small cell) foam wrap like you sometimes see protecting electronic devices. It's tiny cells resist heat transfer better then the large cells in bubblewrap and our radios would work better too. Still it would take over 2 inches of thickness to achieve Scamp's R15 claims. That said, Scamp's bubblewrap is way better than nothing, just wish the would save money and leave out the foil.