Coaxial Splitter Used as Combiner?

[HawaiianShirts]

I've been messing with my cable box this morning, and I want to know if I'm going to cause myself any problems.

I have cable internet coming in, but no cable TV service. I have a rooftop antenna for TV. The trouble is that there is only one jack to connect to the house wiring.

I have a passive coaxial splitter. Can I use it as a combiner instead, putting the Internet source in one of the outputs and the antenna source in the other, then connecting both to the single house jack through the input connection?

It seems to be working so far...

[emax4]

I understand the internet connection via a coax is going to one of the outputs (now an input since you flipped the splitter), but what about the outside antenna input? "if there's "one jack to connect to the house wiring", which jack is that going to on the outside? You may be able to just purchase an HDTV antenna and use the coax jack directly to the TV, bypassing the outside antenna.

[It's me]

As long as the signals you are combining are on different frequencies you will be okay. However.... keep in mind that the antenna signal isn't just being fed to your house... it will also be sent out through the cable modem connection to the rest of the cable network. You may have some very unhappy neighbours when they find their cable channels are being messed up because the frequencies are the same as the ones coming in from the antenna.