I'm actually in Honolulu right now and happened to come across the thread coincidentally...
From what I see, the PD is on some sort of EDACS system and I think I spotted some Harris portables. They look sort of outdated. You can spot the 800 Phantoms on the PD cruisers.
I know there are lots of systems for shuttle buses, taxis, and all the hotels over here. EVERY taxi that I've seen has an antenna (with the exception of a few) and the same can be said about the shuttle buses. The note about the towers having to withstand such extreme wind is interesting, I would have never even thought about that but it is totally necessary.