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Home / Lighting / Driving & light bars

RG58AU low loss coaxial cable, 50 ohm, 5mm diameterRG58AU low loss coaxial cable, 50 ohm, 5mm diameter — cable coil detail

Elevate Automotive

RG58AU Low Loss Coaxial Cable 50 Ohm 5mm Diameter

RG58AU

RG58AU-grade 50Ω low-loss coaxial antenna cable, 5mm diameter, sold by the metre for UHF, VHF and RF radio feedline runs.

50Ω impedance
5mm diameter
Low-loss foil + braid shield

$4.50

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Universal fitmentRG58AU-grade 50Ω low-loss coaxial antenna feedline for UHF, VHF and other RF radio installs.

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This is a 50Ω RG58AU-grade low loss coaxial cable, 5mm in diameter, built for UHF, VHF and other RF communication runs, the antenna feedline used between a UHF CB or VHF radio and its aerial in 4WDs, trucks, caravans, boats and base stations.

Construction is a multi-strand tinned copper centre conductor, foam PE dielectric and a foil-plus-braid double shield inside a UV-stabilised PVC jacket, giving a stable 50Ω impedance and solid screening against interference along the run. Sold by the metre so you can cut exactly the length your install needs, from a short in-cabin jumper to a full roof-to-dash run.

This cable is sold bare with no connectors fitted, pick up matching RG58 connectors (PL259, BNC, FME or TNC, depending on your radio and antenna) separately to finish each end.

You'll also need

Series of GME Plugs/Adaptors For UHF

$11.00

  • Low-loss coax — foil + braid double shield
  • 50Ω impedance — matched to UHF/VHF radio gear
  • 5mm diameter — flexible for tight routing
  • Foam PE dielectric — stable impedance along the run
  • UV-stabilised PVC — outdoor and under-bonnet ready
  • Sold per metre — order exactly the length you need

Cable

Type: RG58AU low-loss coax

Impedance: 50Ω ±3Ω

Outer diameter: 5mm

Construction

Centre conductor: 19/0.20mm tinned copper

Dielectric: Foam PE

Shielding: Foil + tinned copper braid

Jacket: UV-stabilised PVC

Electrical & temperature

Attenuation @200MHz: 20.5dB/100m

Attenuation @400MHz: 26.3dB/100m

Velocity of propagation: 77%

Voltage rating: 1500V RMS

Operating range: -20°C to +80°C

RG58AU-grade 50Ω low-loss coaxial antenna feedline for UHF, VHF and other RF radio installs.
4WDs, trucks, caravans, boats and fixed base stations
UHF CB and VHF radio antenna feedline runs
Not a power cable, carries RF signal only, not DC current

Q: What does "RG58AU" actually mean?
RG-58A/U is the US MIL-spec cable designation, "RG-58" identifies the cable family, "A" marks a design revision (a stranded, not solid, centre conductor for better flexibility), and "U" means it meets the general-purpose "Universal" spec. Australian suppliers commonly drop the slash and write it as "RG58AU", but it isn't an Australian-specific designation, it's the same cable family used worldwide for 50Ω UHF/VHF radio feedlines.

Q: What does "50Ω impedance" mean and why does it matter?
Impedance describes how the cable resists the flow of a radio signal along its length. Your radio, cable and antenna all need to be matched to the same impedance, 50Ω is the standard for UHF/VHF two-way radio gear, otherwise you lose signal and risk damaging the radio's output stage. This cable is built to 50Ω ±3Ω.

Q: What does "low loss" mean, and how much signal does this cable actually lose?
All coax loses some signal as heat over distance, "low loss" means less loss than a standard-grade cable of the same size. Manufacturer test data for this cable shows attenuation of 20.5dB per 100 metres at 200MHz, rising to 26.3dB per 100 metres at 400MHz. For a typical antenna lead a few metres long, that loss is small.

Q: Is this suitable for UHF CB radio?
Yes. Australian UHF CB runs on the 476-477MHz band, and this cable's 50Ω impedance and low-loss construction are exactly what UHF CB antenna feedlines are built to.

Q: What connectors work with this cable?
It's sized for standard RG58 connectors, PL259, BNC, FME and TNC are all commonly used, matched to whichever connector your radio and antenna take.

Q: Does this cable come with connectors fitted?
No, it's sold as bare cable so you can cut it to length first. Connectors are crimped or soldered on afterwards to suit your radio and antenna, and are sold separately.

Q: Can I order this in a continuous roll?
Yes, it's cut to length per metre and supplied as one unbroken run unless you ask for it cut into separate pieces.

Q: Does running this cable near power wiring affect the signal?
Keep it away from power cables and sharp edges where practical. The cable is shielded, but routing it hard against a noisy power feed (inverter, DC-DC charger) can still introduce interference, and abrasion against sharp edges over time can damage the shield and reduce performance.

Q: Does cable length affect how well my radio performs?
Yes, longer runs lose more signal. Keep the run as short and direct as practical between the radio and antenna. A few extra metres on a low-loss cable like this makes little difference, but doubling or tripling the length starts to add up.

Q: What's the difference between the foil-plus-braid shield on this cable and a basic single-braid cable?
This cable uses a double shield, an aluminium foil layer plus a tinned copper braid over it, rather than a single braid layer. The extra shield layer gives better rejection of outside interference and a more consistent signal along the run than a basic single-braid cable.

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