This may be a bit of a digression, but stick with me here...
Keep in mind, up until 1998 Sky was a UHF service - so it's coverage depended on them being on your local transmission tower... and expansion only gathered pace in the mid 1990s.
[From Wikipedia]
The company was founded by
Craig Heatley,
Terry Jarvis, Trevor Farmer and
Alan Gibbs in 1987 as Sky Media Limited. It was formed to investigate beaming sports programming into nightclubs and pubs using high performance 4-metre satellite dishes by Jarvis and an
engineering associate Brian Green, but was redirected into pay television following successful bidding in early 1990 for four groups of UHF frequencies in the
Auckland,
Hamilton and
Tauranga regions.
Initially operating only in the Auckland region, Sky contracted Broadcast Communications (now
Kordia) to provide the broadcast service and transmission.
Later, funding allowed Sky to extend its coverage throughout most of New Zealand: In 1991, the company expanded to
Rotorua,
Wellington and
Christchurch. Then in 1994, the company expanded to
Hawke's Bay,
Manawatu,
Southland and
Otago, followed by the
Wairarapa,
Taupo, and
Wanganui regions in 1995. Its final UHF expansion, in 1996, was to
Taranaki,
Whangarei, and eastern
Bay of Plenty Region.
Following the launch of the digital satellite service in 1998, Sky began reducing services on the UHF platform.
Sky switched off its analogue UHF TV service on 11 March 2010 at midnight.
[End quote]
Sure, I quoted Wikipedia.. but it roughly matches with what I remember from the 1990s.. I grew up on the Kapiti Coast (Just north of Wellington - and just at the fringes of Wellington's main transmission tower Mt Kaukau) and remember Sky expanding to our region in that mid-'90s push by Sky.
They got the rights to the NSWRL competition (as it was) somewhere in that expansion - and I seem to recall it was a wee bit before Rugby Union went pro at the end of 1995.
I suspect around 1994-5 was the earliest they had the critical mass of subscriptions AND reasonable reach across NZ to make a good run at sports rights.