[Pasorrijer]

This is not accurate. I don't know of a single installation within a fuselage, because the composite has enough metal in or around it to cause interference.

The fuel concern is a significant one, as well as performance. Enough fuel or performance impacts and you can restrict the airports flown with these antennas. It's not as big a problem on widebodies, but it's the reason you haven't seen WiFi on small regional or the smallest narrow bodies until recently.