UHF or VHF: The One Decision You Can't Undo
Why does this matter more than almost anything else on the spec sheet? Because a UHF radio and a VHF radio will never talk to each other, no matter the brand, no matter the price. Get this call wrong on a fleet purchase and you've got two separate systems that can't communicate, full stop.
UHF (Ultra High Frequency) sits between roughly 400 and 520 MHz. The shorter wavelength is better at bending around and pushing through solid obstacles, buildings, machinery, dense bush, which is why UHF dominates construction sites, warehouses, forestry crews and event teams working around structures and vegetation.
VHF (Very High Frequency) runs lower, generally 136 to 174 MHz. The longer wavelength travels further over open, unobstructed ground, which is exactly why it's the standard for marine radios and why it suits farms, large open worksites and coastal operations where there's nothing much in the way.
A Simple Rule of Thumb
If your team works around buildings, machinery, or thick bush, go UHF. If your team works across open paddocks, water, or clear line-of-sight terrain, go VHF. Mixed environment? UHF is usually the safer general-purpose pick, since most NZ worksites have at least some obstruction to deal with.
- UHF suits: construction, warehousing, forestry, event management, security, indoor and mixed-terrain work
- VHF suits: marine and coastal use, large open farms, and any site with genuinely clear line of sight
One frequency band, chosen properly for your actual environment, beats a mixed fleet every time.
Power and Range: What Wattage Actually Buys You
Ever seen a radio box claiming 25 kilometres of range and wondered if that's realistic? It isn't, not on a real worksite. That figure is measured under perfect conditions: a clear day, no obstructions, both radios on high ground with a direct line of sight. Your actual worksite has none of that.
Most commercial handheld radios sold in NZ run between 1 and 5 watts. More power generally means a stronger signal that pushes further and penetrates obstacles better, but wattage isn't the only variable. Terrain, buildings, weather, and even the height of the person holding the radio all affect real-world range.
Realistic Range Expectations
As a rough guide, a 1-watt handheld might comfortably cover a single building or a short outdoor distance with some obstructions. A full 4 to 5-watt commercial radio extends that considerably further, and is the standard choice for construction sites, larger farms, and multi-building operations.
For sites where even 5 watts isn't enough, a repeater is the answer, not a stronger handheld. A repeater picks up a weaker signal and rebroadcasts it at higher power from a fixed, elevated location, which is how large sites and multi-storey buildings get consistent coverage without dead zones.
Durability: The IP Rating That's Actually Worth Paying For
What happens the first time a radio gets dropped in a puddle on a wet Tuesday? If it isn't properly rated, that's the end of it. Durability isn't a nice-to-have on a NZ worksite, it's the difference between a radio that lasts years and one you're replacing every few months.
The Ingress Protection (IP) rating tells you exactly what a radio can survive. The first digit covers dust resistance, the second covers water. An IP67 rating means the radio is completely dust-tight and can survive being submerged in one metre of water for up to 30 minutes, a realistic minimum for construction, forestry, agriculture and marine-adjacent work in NZ conditions.
IP Ratings at a Glance
| Rating | What It Survives | Realistic For |
|---|---|---|
| IP54 | Dust protection and light splashing only | Light indoor or hospitality use, not outdoor trade work |
| IP67 | Fully dust-tight; 1 metre submersion for 30 minutes | Construction, forestry, agriculture, general outdoor trade use |
| IP68 | Dust-tight; deeper or longer submersion than IP67 | Marine work, sites with standing water or heavy, sustained rain |
Beyond the IP rating, look for MIL-STD 810 certification, a set of US military test standards covering drops, vibration and temperature extremes. It's a genuine indicator that the radio has been drop-tested rather than just assumed to be tough.
If your crew works around explosive atmospheres, fuel depots, gas facilities, grain silos, an intrinsically safe (IS) rated radio is a separate, non-negotiable requirement. A standard radio, however rugged, can become an ignition source in that kind of environment.
Licensing in NZ: PRS, GURL and RSM Explained
Do you actually need a licence to run a two-way radio in New Zealand? Sometimes yes, sometimes no, and getting this wrong can mean interference problems or, in rarer cases, compliance issues down the track. Here's how it actually breaks down.
New Zealand's radio spectrum is managed by Radio Spectrum Management (RSM) under the Radiocommunications Act 1989. Some frequency bands are set aside as a General User Radio Licence (GURL), meaning anyone can use them without applying for an individual licence, provided their equipment meets RSM's technical standards.
UHF CB and the Personal Radio Service (PRS)
The most common GURL band for everyday use is UHF CB, also called PRS. It's genuinely free to use, no application, no fee, and it now offers 80 channels, expanded from the original 40 back in 2011. That's a real, useful option for casual, family, or light business use where a shared public band isn't a dealbreaker.
The catch is exactly that: it's shared. Everyone else in your area with a UHF CB radio is potentially on the same channels, and in built-up areas that can mean genuine congestion and a lack of privacy for anything sensitive.
When a Licensed Frequency Makes Sense
For a business that needs a clean, private, interference-free channel, an individual RSM licence is usually the better investment. It gives you exclusive use of a specific frequency in your operational area, which matters when clear communication is tied to safety or when you simply can't afford to share airtime with a stranger's UHF CB chatter.
| Licence Type | Covers | Annual Fee |
|---|---|---|
| UHF CB / PRS (GURL) | Shared, public 80-channel band, no application needed | Free |
| Standard individual licence | A single land mobile repeater location, or simplex use | $190 |
| Land mobile (up to 5 locations) | Up to 5 repeater locations on one frequency nationwide | $800 |
| Land mobile (unlimited) | Unlimited repeater locations on one frequency nationwide | $1,800 |
Push-to-Talk over Cellular (PoC) radios sit outside this system entirely. They run on the mobile network rather than a licensed radio channel, so there's no RSM fee, just an ongoing data plan, which is worth knowing if your team is spread across a wide area with good cellular coverage.
Digital or Analogue: Is DMR Worth the Upgrade?
Still running analogue and wondering if digital is just marketing spin? It isn't. Digital Mobile Radio (DMR) is a genuine technical step up, not a repackaged version of what you already have, and understanding the difference helps you decide if it's worth paying for.
Analogue radio transmits your voice as a continuous wave. As you move further from the source, that signal degrades gradually, getting crackly and quiet before eventually disappearing. DMR converts your voice into digital data first. The result is audio that stays clear right up until the edge of range, then drops out cleanly rather than fading into static.
Here's a short explainer on what DMR actually changes in practice:
The Practical Differences
- Clearer audio: digital processing filters background noise more effectively than analogue ever could
- More capacity: DMR's TDMA technology splits one licensed channel into two time slots, letting two separate conversations run on the same channel at once, effectively doubling capacity without an extra licence
- Better security: digital signals can be encrypted, where analogue chatter can be picked up by anyone with a scanner
- Data features: GPS location, text messaging and lone worker alerts are only practical on a digital platform
Most current digital radios also run in mixed mode, meaning they'll talk to your existing analogue fleet while you migrate. That matters if you're not in a position to replace every radio at once. You don't need to choose between old and new on day one, you can move at your own pace.
Getting the Right Radio for Your Team
Every decision in this guide, frequency, power, durability, licensing, digital or analogue, only makes sense once you know exactly how your team actually works. A spec sheet can't tell you that. A proper conversation about your site, your industry and your existing gear can.
Mobile Systems Limited has supplied, installed and serviced two-way radio systems from Mount Maunganui for over 25 years, as a 100% New Zealand owned communications specialist. We carry Tait, Hytera, GME, Motorola, Icom, Uniden and Entel, and we don't push a brand that doesn't fit your actual job.
RSM Licensing Handled
We manage the licence application and programming, so your radios are compliant from day one.
Programmed to Your Site
Channels, talk groups and safety features set up to match how your team actually communicates.
Nationwide Supply
On-site installation across the Bay of Plenty, Coromandel, Rotorua, TaupΕ, South Waikato, Volcanic Plateau and Eastern Waikato, with nationwide equipment supply and licensing for everywhere else.
Ongoing Support
Servicing, repairs and fleet expansion, so your investment keeps performing for years, not months.
