“Normal channels” means over-the-air reception?
Certainly, any computing device can cause some RF interference but it doesn’t seem nearly as common as it once was. Of course, the usual FCC advice about moving/reorienting the devices may help. Also, what kind of antenna is in use and where is it? If it’s just a simple antenna wire plugged to the antenna port, placing a few feet of RG6 cable in between the TV and the antenna can do wonders both for getting the antenna away from other devices and for getting it up in the air in general.
