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ANYTHING electronic can cause rf interference
That's why the FCC created part 95 rules
And cable modems are among the WORST for throwing out broad band rf interference
I've seen twist and led light bulbs cause interference as well as appliances, scanners, and anything that is "wireless"
Your cell phone and local ATT and Verizon 4GLTE towers can cause interference to your tv reception as well since 4GLTE signals now occupy the 700mhz region and will soon be in the 600mhz region as well these signals desense and overload antenna preamps and can desense the Tv receiver
Those wireless outdoor thermometers can easily cause your tv to go to pixels on certain channels every time they transmit
Anything that has a microprocessor can and will generate RF that can cause interference
so the easiest way to troubleshoot is to remove the power from any suspected device to see if it goes away
Keeping your antenna as far away from potential rf intereference sources is always a good practice
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