I assume you would be happy to watch the same program in the second location as the first? The only way to watch more than one channel is to have more than one digibox.
So same channel in two locations.
1. Straight forward TV coax from the RF socket to a second TV.
2. TVlink style device, connects to RF2 and carries a small voltage to enable the digibox to be controlled from another location. Alternative is a video sender device, wireless so no cables and has stereo audio unlike the TVlink which is mono.
3. Direct from SKY, Argos, online retailers, DIY superstores.
Satcure website has some examples and prices.
If you want to feed the SKY digibox output to more than one location you will be looking at a more advanced and complex RF distribution system, not upto speed on the technical ins and outs of that sort of system.
There will be some posters here that can help you though

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