Keg - only thing is - all those items are extremely low powered (by comparison) and the jets wiring should be moderately well shielded from general interference items such as those.
I know many crews who leave their phones on all the time - the only downside is your phone looks for a station all the time and the battery goes flat quickly.
In fact sit in business class and its amazing how many phones start getting msgs (some punters dont care as their phones beep continuously) at about 1000' on finals.
Also I find it hard to believe any phone or ipod like item will ever cause interference. (Not saying it wont just very unlikely and likely to be some mitigating factor)
Yet a military base may have the ability to.... does this base only transmit VLF? Or is it capable of other transmissions which may cause interference?