Who I have the same questioned this topic

I just installed 2 Samsung 4G network extenders in two separate homes.  Work fine except they interefere with one tv in each home.  Each home has 3 tvs but only one is affected.  We use dish, not cable for our tv.  The tv is simply "snowy"  the picture is visible but terrible quality.  Neither tv is a smart tv.  If the extender is unplugged, the tv works just fine.  Any suggestions??