There's a lot of muddled 'information' being played in this thread and elsewhere on prrune about radio emissions,
1) Different devices and and different bandwidths have to be considered seperately. The "it's all really scary" idea is an unhelpful nonsense.
2) The signals emitted by CRTs and associated HT gear in televisions is not relevant. Passengers do not bring televisions on to aircraft.
3) With respect to WiFi, "noone really knows" is quite a sweeping statement to present as fact. Lufthansa, their aircrew et al obviously think they do know reasonably well enough.
4) The power levels for WiFi are considerably lower than for mobiles, and this is part of the general standard, not an aviation specific implementation.
5) There are often quoted 'document incidents' in these discussions. It would help credibility if URLs were posted, i.e. to the relevant NTSB/AAIB reports or whatever.