I installed Freeview Terrestrial in the weekend, with partial success only.  Specifically I have TVNZ and TV3 et al Channels good, and the Prime/Maori/Trackside group are dectable but not viewable.  I understand from searching the forum this means I am not picking up the Kordia MUX.

I am in Nelson, in "very likely" coverage area, with clear line of sight to the Mt Campbell transmitter which is 40km away and 1300m higher than our house.

I removed the old VHF and installed a new antenna - I am too new to post a link but its a Dick Smith L4735.

I used an F-crimp fitting and using sheildked RG-6 I have run the feed directly to a wall plate which has a saddle and clamp style termination, then via a 1.5M PAL lead to the TV, which is a Freeview Ready Sony Bravia.

I have spent a lot of time experimenting with aerial direction and I am confident its correct. 

Any help appreciated, but the two main things puzzling me at the moment are: -

1) Is 40km too far for an unamplified signal?
2) The elements on my aerial are X-shaped, but they are vertically compresed so they look kind of like and x wing fighterand I am unsure if this makes them vertical or horizontal polarity. 
(My neighbours all have rod style vertical elements and according to wikipedia Mt Campbell is vertical polarity).