Hi Jeanaef
Lets have a go then. Firstly power everything off at mains.Then remove all connections TO TV.
1) Connect your aerial lead from wall socket to RF IN socket on TT box.
2) Connect aerial lead from RF OUT on TTbox to RF IN on your DVD recorder.
3) Connect aerial lead from RF OUT on your DVD to RF IN on your TV.
4) Connect HDMI lead from TT BOX to one of the HDMI sockets on TV.
5) Connect HDMI lead from DVD to other HDMI socket on TV.
If you do not have 2 HDMI leads, for now you can connect one of the boxes via SCART TO THE TV !!!
I am assuming that the TTbox is currently working. Ensure that RFLoop Through is ON - You viewbutton on remote -SETTINGS from bottom of screen, _ DEVICE MANAGEMENT.
Power ALL back on and it SHOULD all be working with you being able to switch between TV,TT Box and DVD via TV remote. TV, HDMI 1 or HDMI 2 depending on which you have connected to which input, at this stage you will need to use TT controller for this seperately so lets try this first to make sure all is working properly.
As I said this should work BUT as with all things they rarely work perfectly first time from a distance, so PLEASE let me know what happens. !!!!!
Personally I would use an aerial splitter and have a seperate aerial lead to each item so that you still have the TV if any of the other items fail, but that is something for later.