Computer interfering with TV signal?

[ManicMachine]

Has anyone encountered this as of late?

My new computer is causing poor reception on channels 2 and 4 of the TV in the room next to me seperated by about 15 feet.

 

[Shakezilla]

Could be whenever my girlfriend comes over she has to turn off her cell phone in my room because it makes the TV speakers go crazy.

Do you have wireless? Is the TV on an antena?