You seem a bit confused; there are no such things as “Sky analogue programes” - Sky is an entirely digital service supplied via satellite broadcasts, received via a dish.
TNT is a French digital terrestrial service (i.e. from land based transmitters) & is received via an aerial.
The services do not mix; your Sky box needs to be connected to it’s dish to receive incoming broadcasts, & then to your TV via an HDMI or SCART connexion. Your TNT decoder needs to be connected to a suitable aerial & then to your TV via HDMI or SCART. If your TV is modern enough to have an HD tuner built in there is no need for a separate TNT decoder.
This all assumes you aren’t trying to receive French TNTSAT broadcasts - that kind of decoder would require a separate dish, or clever mulitple LNBs on your existing Sky dish.
Sky boxes do have the ability to send an RF TV signal to a remote TV via a standard coaxial cable. Maybe this is where you are getting in a muddle?