There have been a few posts from people complaining about Ondigital reception.
As a Sky digital & Ondigital customer I can say that Sky is not without its problems also. Good reception on both systems depends on the quality of the installation.
When Sky digital is installed it uses a new dish, double screened coaxial cable and high quality connectors. Ondigital on the other hand is sold as plug and play, however it is my experience that a similar quality set-up is required for 100% reception with the right aerial for your transmitter, a good screened cable without joins (satellite quality) and a tight fitting coaxial plug.
I know that in this forum people have stated they receive perfect pictures from their previous aerials, indoor aerials, loft aerials etc. however you can’t beat an outside aerial. I my case the aerial cost me £19 and the cable £20 which I put up myself.
A modern digital aerial has to deliver a strong signal and a clean signal, balanced across a wide range of frequencies.
Perhaps the reason we could live with the performance of unmatched aerials in the past was that we were only ever looking for four signals and if they got through, even with a little bit of ghosting most consumers were satisfied with the result. The problem now is that we are looking for ten or more signals and multiplexes across a wide frequency range and its not a consumer that we have to satisfy, but a black box!