This cache probably seems like a completely random placement somewhere along the walkway that climbs Rangituhi - and to some extent it is. But having climbed quite consistently to reach the nearby communication equipment there is a notable change here where you feel like you've levelled off somewhat and now walking along the ridge. It's not at summit altitude by any means but the climb is generally much more gentle from here save for a couple of short steeper sections. From down in Titahi Bay which is more or less north of here, the nearby antennae looks like the summit because the average gradient from here to the summit is so much lower and you can't see "over" this point to the summit. Indeed the round-topped nature of the hill is why its colonial name is Colonial Knob (knob being the geographical term for a rounded hill). Although references will frequently tell the origin of the name Rangitugi ("sky glow" - an effect seen at sunset from the Porirua harbour area), the reason for the generally deprecated name of Colonial Knob is harder to come by.
If the otherwise random location wasn't bad enough the cache is nothing special either! But it's no worse than any others you'll find up here at the time of publication. At least it's not a micro or a Sistema, so there's that.
No hint is required to find this but there is one in case the cache goes missing.
Note that while dogs are permitted on-lead down on the lower slopes they are not permitted up here because of the adjacent farm land.