If you are trying to feed RF2 to two TV sets and use a magic eye, the only way to achieve this is with a compatible "amplified splitter" which will pass the magic eye signals back to the Digibox. You can't use an ordinary 50p splitter. The amplified splitters have a gain of around 7dB which is good for boosting the signal through some 7/0.18 = 39 metres of CT100 cable. The amplifier can be fitted next to the Digibox or up to 20 metres of cable away from the Digibox. (The latter is preferable but not always practical. Total cable length to each TV should be 40 metres in order to "lose" the extra signal, although most TV sets will be happy with a small overload.
See
http://sam-radford.me.uk/tvlink.htm