You may find the channels can't be tuned. NZ Channel One is a lower frequency compared to other countries. Most sets now have channels preprogrammed in a ROM.
You might want to sell your old set and buy one there or look on FreeCycle or Craig's list for one.
Google for (new zealand tv channel allocations)
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New Zealand
44-51, 54-68 MHz: Band I Television (channels 1-3) 87.5-108 MHz: Band II Radio 174-230 MHz: Band III Television (channels 4-11) In New Zealand, the four main Free-to-Air TV stations still use the VHF Television bands (Band I and Band III) to transmit their programmes to New Zealand households. Other stations, including a variety of pay and regional free-to-air stations, broadcast their programmes using the UHF band since the VHF band is very overloaded with four stations sharing a very small frequency band.New Zealand: Ch:NZL1 45.25MHz Ch:NZL2 55.25MHz Ch:NZL3 62.25MHz