In the Ranger case you are talking about spurious emmissions from a 27 MHz fundamental and not about VHF parasitics. They are two COMPLETELY differant things.Even cable companies are not permitted to downconvert to the VHF airband because leakage from the supposed closed cable system can and has caused interferance to air communications and navigation. I know this as fact because when I was getting approval for a new FM broadcast transmitter I was getting my nickel's worth by asking the guy from Nav Canada all sorts of questions.
Sorry, but in the Ranger case the FCC was claiming the second, third and fourth harmonics, which are in the VHF, could cause interference to airline navigation. There has never been a confimed, duplicated case of airline interference by any consumer product.
"The airlines are misleading the traveling public," says John Sheehan,
who headed the RTCA study and says he has often used his own cell
phone in the sky. "There is no real connection between cell-phone
frequencies and the frequencies of the navigation" or communications
systems.
"Using cell phones aloft on commercial and private aircraft is banned
not by the FAA but by the Federal Communications Commission, which
regulates telephone use. In prohibiting airborne use in 1991, the FCC
was mainly concerned about cell phones' potential to interfere with
ground-to-ground cellular transmission."
Cell phones on planes
It seems that when you use your cell in a plane, you can connect to multiple cell towers at the same time, rather than being sequentially handed off from one tower to the next, as happens when you are on the ground. Cell companies don't like this because if you connected to multiple cell towers at once, less people can connect. Money talks, so the FCC bans their use on airplanes and hot air balloons.
See also Boeing's website itself:
Aero 10 - Interference from Electronic Devices
"Electromagnetic interference (EMI) from passenger-carried portable electronic devices (PED) on commercial airplanes has been reported as being responsible for anomalous events during flight. The operation of PEDs produces uncontrolled electromagnetic emissions that could interfere with airplane systems. Airplane systems are tested to rigorous electromagnetic standards to establish and provide control of the electromagnetic characteristics and compatibility of these systems. However, PEDs are not subject to these same equipment qualification and certification processes. Though many cases of EMI have been reported over the years, with PEDs suspected as the cause, it has proven almost impossible to duplicate these events." (emphasis added)
As I said before, unless you have about 1000 watts of power and are sitting under an approach to the airport you are not going to interfere with airline navigation. The FCC just uses interference as an excuse to justify their actions.