What is antenna gain, and why does it matter?

Gain describes how well an antenna focuses radio energy in a useful direction rather than spreading it equally in all directions, a bit like a magnifying glass focusing sunlight. Higher gain means a stronger, more concentrated signal, which helps when you're trying to reach a distant repeater or overcome obstacles like buildings or hills. Most mobile antennas have a gain of around 5 dB, which is a sensible balance for general use.

What is a ground plane, and do I need one?

A ground plane is a flat, electrically reflective surface that some antenna types need underneath them to work properly. The centre of a vehicle roof makes an ideal ground plane because it's flat, metal, large enough in every direction, and unobstructed. Mounting an antenna near the edge of the roof or on the bonnet still works, but you may notice some directional effects as a result.

Does cable length affect my antenna's performance?

Yes. Every metre of cable between the antenna and the radio causes some signal loss, and that loss increases at higher frequencies such as cellular. As a rough guide, runs up to 8 metres of standard RG-58A/U cable perform acceptably. For longer runs, a lower-loss cable is strongly recommended to avoid the cable loss cancelling out the antenna's gain entirely.

Can I paint my antenna?

Yes, as long as the paint doesn't contain metal flakes. Metallic paint can disrupt the antenna's signal characteristics, so stick to standard, non-metallic paint if you want to match your vehicle's colour scheme.

Does antenna height really make a difference?

Significantly. Raising an antenna by around 5 metres can extend effective range by up to 30 percent in rural settings, since height helps the signal clear obstacles and reach further over the horizon. This is one of the simplest, most cost-effective ways to improve coverage on a fixed or repeater installation.

What's the difference between a whip antenna and a Yagi antenna?

A whip antenna is omnidirectional, meaning it sends and receives signal equally in all directions, which suits general mobile and handheld use. A Yagi antenna is directional, concentrating signal toward one point, such as a distant cell tower, giving much stronger performance in that direction at the cost of reduced coverage elsewhere. Yagis are commonly used for fixed cellular boosting where you know exactly where the signal source is.

Why is my antenna mounting position important?

Mounting position affects both signal strength and pattern. Antennas mounted centrally on a vehicle roof generally perform best and most evenly. Off-centre mounting, such as on a bull bar or wing mirror, can work but often introduces directional weak spots. We can assess your vehicle or vessel and recommend the mounting position that gives the most reliable coverage for your specific use.