Hopefully someone can help me here...

We live in Grey Lynn and have good lines of sight to Sky Tower and Waiatarua transmitters. For the last 10 years we had a chimney mounted YAGI aerial pointing towards Waiatarua and have generally enjoyed good digital freeview reception except sometimes during storms and wind when we've had the odd bout of signal loss / pixelation on occaision. 

After our reno and loss of the chimney (and replacement with a wood burner flue), the old YAGI was stuffed (half the bits had fallen or broken off and blown away), I went to JA Russell and stupidly let them sell me a Match Master phased array antenna which they said was best suited for our address. The antenna we purchased looks like this (it may be only a single array rather than two - I can't recall!)

(I didn't know that there were different types of UHF aerial when I bought the phased array one - I mentioned to the guy that it didn't look like my old one and he said that the phased array was recommended for our location and here I am...)

Reading up on this, I understand that depending on which transmitter I am pointing at, I may have to mount the antenna at a 90 degree offset (i.e. rotate right or left 90 deg) as Waiatarua and Sky transmit on different polarities to avoid interference with one another. 

Can any tell me how I should orientate the aerial for (1) Sky Tower (i.e. pointing eastwards from Grey Lynn) or (2) Waiatarua (if pointing westwards from Grey Lynn). 

Thanks.

PS, after our reno we now have multiple TV aerial splitters and feeds (don't know why as we told the sparkies that we only had two TV locations, but they sure like to add redundancy when doing home cabling eh? Its also not easy when they've run digital coax everywhere which looks the same as the aerial cabling). Thus I am keen to get a strong signal with no or minimal interference...