It may be tempting to pick the biggest antenna or the one with the most impressive specifications but choosing the right antenna depends mainly on what you want to listen to, where you plan to use it, and how far away the signals you’re trying to receive are located.
A little understanding of a few basic antenna characteristics can make a big difference in your scanning experience.
What Frequencies Do You Want to Receive?
This is definitely the most important consideration. Centerfire scanner antennas are designed to operate over specific frequency ranges, and no single antenna performs equally well across every frequency.
For example, someone interested in local police, fire, and emergency services may primarily be listening in the VHF-150 MHz and UHF-450 MHz bands. Aircraft communications, railroad activity, or other services may have different frequency requirements.
Before buying an antenna, identify the frequencies you intend to monitor. Check online databases for the frequencies being used in your county and all surrounding counties. An antenna that performs well in one frequency range may be considerably less effective in another. Also, be realistic about your range. By design, public service frequencies do not travel far and distant signals may not be accessible in your location.
Wideband scanner antennas are convenient because they cover multiple frequency ranges, but there can be performance compromises compared with an antenna designed for a narrower range.
Indoor or Outdoor Installation?
Where you install your antenna can be just as important as which antenna you purchase.
An outdoor antenna can sometimes have a significant advantage over an indoor antenna because it can be mounted higher and away from obstructions. Buildings, trees, metal siding, and other objects can weaken or interfere with incoming signals.
If you’re primarily interested in receiving local transmissions, an indoor antenna may be perfectly adequate. However, if you’re trying to improve reception in a challenging location, an outdoor antenna is usually worth considering.
Even moving an antenna a few feet or placing it near a window can sometimes make a noticeable difference.
Antenna Height and Location
When it comes to receiving VHF and UHF signals in fringe areas, antenna height is important. These frequencies generally travel by line of sight, meaning that hills, buildings, and other obstructions can limit reception.
Getting an antenna slightly above the roofline can often produce better results than simply purchasing a larger or more expensive antenna.
If you’re mounting an antenna outdoors, try to find a location with a reasonably clear view of the surrounding area. Avoid placing it directly next to large metal objects or other sources of interference. Stay clear of overhead power lines.
Omnidirectional or Directional?
Most Centerfire scanner antennas are omnidirectional, meaning they receive signals from multiple directions without needing to be pointed toward a particular transmitter.
This is usually the best choice for general scanning, especially if you’re monitoring several agencies or services located in different directions.
Directional antennas, such as Yagi antennas, concentrate their reception pattern in a particular direction. They can be useful when trying to receive a distant transmitter or improve reception from a specific location. The tradeoff is that you may lose reception from other directions and they are considerable larger than omni-directional antennas.
What About Antenna Gain?
Antenna gain is often used as a selling point, but higher gain isn’t automatically better for every scanning application. Gain is often misunderstood and exaggerated.
Higher-gain antennas generally concentrate their reception pattern differently, often favoring signals closer to the horizon. This can be beneficial for receiving distant ground-based transmitters, but it may not be ideal for every location or frequency.
In our opinion, a scanner antenna with gain is necessary in only a few applications. For general scanning, a well-designed antenna with frequency coverage in your selected frequency range may often outperform an antenna with impressive advertised gain figures.
The Bottom Line
The best scanner antenna is the one that matches your listening interests, location, and installation.
Start by identifying the frequencies you want to monitor. Consider whether you need an indoor or outdoor antenna, how high you can mount it, and whether you need reception from multiple directions.
A properly selected and installed antenna can make a bigger difference in scanner performance than many people realize. Take the time to choose the right one, and you’ll get much more enjoyment out of your scanner.