However, if his setup is like mine (and I don't know why mine would be unique), testing the TV and finding no TV signal wouldn't preclude there not being internet available. Plus, if there *is* internet at that location, he needs to move his modem there anyway, may as well do it right and test the thing you want to test (will modem work there), not something similar (is there TV signal there). On top of that, if the wire isn't connected to *anything*, he'll need to test the modem there to rule out the situation being like mine.

I wasn't trying to correct anyone's statement...I was trying to show how:
a. He may come to the wrong conclusion using a TV to check
b He may end up doing double the work--testing with a TV, and then having to test with the modem and move the modem there anyway if the TV tests out with signal.

Like all internet advice, opinions and experiences, one needs to see how the similarities apply to oneself and how the differences need to be accounted for.

My setup has a filter so that no TV signal goes to the split that feeds the modem, but there's no filter on the TV ones. So, a TV signal MIGHT also have the internet signal, but no TV signal doesn't automatically mean that there's no internet.

There shouldn't be high voltage or anything that would ruin the mode, so give it a try. It's easier to move your modem and router than a TV and THEN your modem and router.