UHF and VHF: The Basic Physics
UHF (Ultra High Frequency) and VHF (Very High Frequency) are two slices of the radio spectrum. For land mobile two-way radio, VHF typically sits around 136 to 174 MHz and UHF around 400 to 512 MHz. The number that matters most is not the frequency itself, it is the wavelength that comes with it.
Think of sound in a house. A deep bass note rolls easily across an open paddock. A sharp knock carries through a closed door far better. VHF behaves like the bass note, UHF like the knock.
Why VHF goes further in the open
VHF's longer wavelength travels efficiently over clear ground and water. With good line of sight and few obstacles, it will typically reach further than UHF at the same power. The moment hills, buildings or thick bush get in the way, though, it fades faster.
Why UHF copes better with clutter
UHF's shorter wavelength does not travel as far across open country, but it handles solid obstacles much better. It reflects around corners, through doorways and up stairwells rather than being stopped outright.
Neither band is better. Each is built for a different kind of ground.
Which Band Suits Which Environment
Picking the wrong band for the site is the single most common mistake in a two-way radio purchase. Here is how the common NZ working environments line up.
| Environment | Better Band | Why |
|---|---|---|
| Construction sites, warehouses, factories | UHF | Copes with concrete, steel and multi-level structures |
| Towns and urban work | UHF | Reflects around buildings rather than being blocked by them |
| Dense forestry and bush | UHF | Shorter waves navigate foliage and uneven ground better |
| Open farmland, station country | VHF | Longer waves carry further with few obstructions |
| Marine and coastal | VHF | The established maritime standard, travels well over open water |
| Mixed hill country | Depends on the site | A site survey beats a generic rule here |
The simple rule
- Mostly open ground or on the water? VHF.
- Inside buildings, around structures, or in town? UHF.
- A mix of both? UHF is usually the safer all-rounder, because most workplaces have more clutter than clear sightlines.
This short explainer walks through the same wavelength trade-off visually, if you want to see it before deciding.
If your site genuinely has both dense obstacles and long open stretches, a single band will be a compromise somewhere. Testing real signal where your team works is the only honest way to find out where.
When Your Terrain Beats Both Bands
What happens when neither band reaches? The answer is rarely a bigger radio. It is changing how the signal gets there.
Add a repeater
A repeater sits on high ground, receives your transmission and re-sends it at higher power, carrying signal over hills and into gullies that handhelds cannot reach on their own. Our guide to simplex vs repeater radio channels explains when direct radio-to-radio stops being enough, and what a digital radio repeater does covers the hardware side.
Use the cellular network instead
PoC (push-to-talk over cellular) radios ride the mobile network rather than line of sight, so hills and distance stop mattering wherever there is cell coverage. Read what PoC is and how it works before assuming a conventional radio is the only option.
Check the antenna first
On vehicle radios especially, a poorly matched or badly mounted aerial can cost more range than the choice of band. Our UHF antenna guide covers gain, mounting and terrain.
Fix the coverage problem at its source, and the band decision becomes much simpler.
RSM Licensing for Either Band
Whichever band you choose, the licensing question is the same: shared public channels, or a private licensed frequency? That choice affects privacy, interference and reliability as much as the band does.
Licence-free public channels
The Personal Radio Service (PRS) UHF CB band offers 80 channels under a General User Radio Licence (GURL). There is no application and no fee, but you share those channels with everyone else nearby, and power is capped.
Licensed commercial frequencies
Commercial use of UHF or VHF on a private frequency is licensed by Radio Spectrum Management under the Radiocommunications Act 1989. Current fees are below.
| Licence Type | Covers | Annual Fee (from 1 July 2026) |
|---|---|---|
| Standard individual licence | A single frequency or simplex use | $190 |
| Land mobile, up to 5 repeaters | Up to five repeater locations on a common frequency | $800 |
| Land mobile, unlimited | Unlimited repeater locations nationwide | $1,800 |
A licensed frequency gives you higher permitted power and a protected channel free of other users' chatter. For any team using radio as a genuine safety tool, that licence is what turns "usually works" into "works when it counts".
What If You Need Both?
Some operations genuinely span both worlds: a forestry company with bush blocks and open skid sites, or a farm with hill country and a boat on the harbour. Because UHF and VHF cannot talk to each other, you have two practical options.
- Two fleets for two zones. Run each band where it performs best, and accept that the two groups are separate networks.
- One band for the majority. Standardise on the band that covers most working time and safety-critical calls, then fill the gaps with a repeater or PoC.
Marine is the one case where the decision is made for you. Boats run VHF, and our VHF marine radio channel reference covers the channels. For land-based rural work, our guide to UHF vs VHF for farming goes deeper on property-specific choices.
Decide by where your team spends its time and where the safety calls actually happen, not by what the neighbour runs.
Getting the Right Band from Mobile Systems
Mobile Systems Limited has matched UHF and VHF systems to NZ terrain from Mount Maunganui for over 25 years, across forestry, construction, agriculture, transport and marine operations. As a brand-independent supplier, our advice points to what suits your site, not a single manufacturer.
Site-Specific Assessment
We test real signal where your team works, rather than guessing from terrain type.
Full Brand Range
Tait, Hytera, Motorola, GME, Icom and Entel, across both UHF and VHF.
Licensing Guidance
We walk you through RSM licensing and programme your radios to their allocated frequencies.
Workshop and Mobile Service
Servicing and repairs from our Mount Maunganui workshop, with mobile technicians across the Bay of Plenty and surrounding regions.
Browse our two-way radio range, or tell us where your team works and we will match the band to the ground.
