lightening strike several months ago which did get into my receiver and TV
What do you mean...lightening fried your receiver and TV? If each is on the same electrical outlet, maybe. If it traveled through your cable system, your cable-box and modem(s) should have also taken a hit. How's the grounding cable look at the NID bolted onto the side of your house?
You're correct about radio frequencies carrying data and some frequencies could be vulnerable to interference from other sources also broadcasting on the same frequency. However, this would be on specific frequencies or specific TV channels. Have you noticed if all channels drop or only a couple?
Care to ask the other House if they're experiencing the same symptoms?
Have replaced only signal splitter with amplified version.
Try a regular coaxial splitter. Too much of a signal can be just as bad as too little. Signals must be within a range.
