i am out on the coast - have tuned into the dvb-t signals from the palmerston north transmitter, all channels on the 690000 frequency have a very low signal quality strength (<30) so cannot view any channels on that frequency, (channels TV1,2,TVNZ6, TVNZ7,TVNZ Sports xtra) - no video erratic audio
channels on 778000 frequency (tv5 maori tv, tv22 parliament tv, tv30 central tv (maori tv),tv100 Freeview HD, ch 242-245 reserved channels) are received much stronger (currently 75 - 85% signal quality) good picture and audio
uhf aerial recently upgraded and tuned to the PNorth transmitter site with a spectrum analyser, results are the same
can receive all analog channels.
the dvb-t channels on the 2 frequencies are clearly at much different signal strengths.
Rang freeview but not much help there.