You don't need 2 cables to receive HD but you do if you are using a Freesat+ PVR
Quote:
Q: I have freesat already. Can I use my existing satellite dish for freesat+?
A: You will be able to use the same satellite dish, however to enjoy freesat+'s full functionality the LNB (the protruding antenna of the dish) needs to be a dual or multiple LNB, and two cables are required from the satellite dish to the freesat+ box. These are required so you can watch one channel and record another. If you don't already have a dual LNB fitted and want freesat+, please talk to your local freesat approved retailer about your installation options.
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http://www.freesat.co.uk/help/faqs