Having trouble finding channels by auto tuning. Have tried to connect to the antenna on the roof (am renting so reluctant to mess with it) as well as buying an indoor antenna with no success. Seems like coverage should be good as I am close to the Remuera transmitter as well as the Sky Tower. Dont know what to do.
What sort of antenna and which way is it pointing i.e towards which Tx?
The Indoor Antenna will be useless so don't even try with that. If it's one of these then it's absolutely useless unless you are close to and can see a powerful Tx. http://www.harveynorman.co.nz/tv-and-audio/freeview-and-digital-tv/...
If using Remuera make sure the antenna is vertically polarised and try manually tuning channels 28, 32, 34, 36. What signal strength do yo get.
Check also to see if there is a masthead amp in situ. If there is you won't get anything unless you provide power for it via the co-ax.
Perhaps you could upload a picture of the roof antenna?
OK. The UHF is vertically polarised so that's OK. However there is a VHF antenna there too and what appears to be a diplexer combining the two antennae. I'm surprised however that there is no signal strength at all. That definitely indicates a cabling problem and there may be an amp in the Diplexer box which has no power. The VHF antenna should be removed completely (redundant) and the diplexer bypassed.
P.S. If you have a helpful Landlord he may be able to sort it out for you.