I will have another play with it and see what i come up with.
It tests fine at every point and the antenna. everything is new, masthead amp, kingray type. it played up while i was there but when i tested it it didnt show any issues. it does it on both tvs, so i dont think its the cable, i even replaced both cables and it still does it. no trees in the way but it is a low area. houses etc in the way. I cant remember the db reading from the antenna but I might work on it being an interference issue with the booster.
thanks for the help
just a little anecdote, and maybe even a reliable one, if not for its actual LACK of scientific research, after just a couple of weeks of viewing one of Samsungs SUHDs and going back to the shop where i was initially blown away by the OLEDs on display, but went SUHD if not just for the price differential, ... suddenly the OLED didnt look anywhere near as "impressive"