Ok, well to connect a FTA receiver, & A Satellite one, to a TV, is quite simple really. The TV antenna, goes into the FTA "Box", ALL Tuning and settings are done on this "Box". The "Box" hooks up to the TV, and uses it simply as a Monitor. This depends on the output, from the "Box". usually, there are Two, outputs. Component, and Composite. With Composite, you have 3 cables, One Yellow, for Video, would go from the "Box" to the TV, color to color. Also you need Audio, this is the Red & White Jack, again, it wires, Color to color. You select, on the TV/remote, the relevant EXTERNAL INPUT for the TV, to display a picture. Now if using Component Video input, well, that uses 3 Cables for Video, Green, Red, Blue, again color to color, at the jacks, also you need the Audio, which is Red & White. All in all Component hookup uses 5 Cables to connect Video & Audio. With Composite, you use 3 Cables altogether, Yellow, is Video, S-VHS, also two more cables must be used for audio, again, ewe use red & White. All in all, with composite, we use 3 cables. So you connect up whichever method you choose. Then after the TV is set to display the Video 7 Audio, Now you use the "Box" to "Tune" the "Channels", which subsequently, are displayed on the TV. All Channel, Volume etc controls, are controlled by the "Box's" remote control. The TV is simply a "Display". You simply hook up, the output from each "Box" to a relevant "Input" to the TV. As related,One composite, one Component, or HDMI. Whatever is available.
You cannot connect a "Receiver" to a "Receiver" The BEST one can do, is use either "Boxes" on an EXTERNAL Video & Audio OUTPUT/iNPUT to the TV, or display device. FTA & Satellite, are on Differing frequencies, and cannot be run from a single antenna, Nor combined Both must have their own antenna, and their own Outputs, You could as drawn connect One Component, & One Composite or HDMI, if available, and select via the TV's remote, and all Channel changing would be done with the "Boxes" remotes. usually one sets a Volume level at the TV, and from then on, ALL controls are via that "Boxes" Remote, for Channel change, Volume etc.