Hi Haggis54,
I've checked out links, identified my transmitter, verified that the channels it transmits are the only ones I'm seeing, noted the future aerial needs. Unfortunately, diy alignment isn't an option as the aerial is on the chimney, not in the loft, and I can't justify buying roof ladders. I will try leaving out the splitter to see if it makes a difference but I don't think it will.
Thanks for your input.