Unless you have a master faceplate in the lounge like this:
Comm faceplate.jpg
it is unlikely the setup will be wired correctly for you to distribute RF around the house. A bog standard aerial distribution system will be deliberately designed to prevent signals going between room sockets, with the path of least resistance being at the aerial input at the top of the house, which will also be where the amplifier (if there is one) is situated.
If it is like the image attached, connect your RF output to the socket marked "return". You should then find an amplifier (usually in a cupboard) that will distribute the signal to the other sockets.