I was told wifi router should not be as close as 4 feet to TV will interfere with Wi-Fi signal how true is this
Well my router is only 3 feet from my PC monitor and shows no signs of interference on the screen at all. Anyhow, if you're router is that close you shouldn't even need to use WiFi - - - use ethernet wired connection instead if your TV has an ethernet port. It will be a much more stable connection and also faster than WiFi.
I don't think ANGEL456 was implying that the WiFi router is
or will be used for the TV signal.
Unfortunately, unless interference is so bad that it obviously
slows down reception of files or streaming, I don't know how
to tell if there is interference. Curiously though, the brand-new
cable box from Comcast / Xfinity which sits atop my prehistoric
CRT TV has WiFi built into it. (Which I have no use for and
would like to turn off, even if I have to break the cable box.)
-- Jeff, in Minneapolis
It is possible that an LCD TV could cause interference on specific WiFi channels. Have a look at this article for a discussion of WiFi interference, and how to minimise it, from other devices/appliances.
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