OTA Diplexers and Internet

[avenger]

I know that diplexers are use with OTA and Satellite systems setup. Is this possible, an OTA antenna with a splitters and coaxes for feeding two Televisions, using two diplexers just like as in a Satellite OTA setup, and using the single internet coax to feed both the computer modem and one of the Television. I know that the splitter side for one television will work, my question is for the side in which the diplexers are connected to the Internet coax.

I will appreciate any input from anyone who have done this.

Thank You.