How far can dual band radios communicate, 30 km? This is one of the most common questions asked by newcomers, but they often do not get a satisfactory answer. This is a complex question that requires a number of factors to be considered.

Obstacles are a very important factor in communication distance. In the city, two handheld radios may only be able to talk for 1-2 km, whereas in open areas, they can easily reach 5-6 km.

The lower the frequency, the better the penetration, but this is also relative. If two radios are separated by a mountain, it is impossible for radio signals in the UHF/VHF band to penetrate them. Dual band radios'signals can pass through many non-metallic objects such as walls, human bodies, furniture and many other objects. However, every time a radio signal passes through an object, the signal strength decreases. So the more obscuration there is, the closer the communication range is.

Ships sailing in the sea can use radio to communicate over long distances, and one of the important factors is that there is no obstruction. Most cell phone base station antennas are located on tall towers or on the roofs of buildings. Antennas for FM radio are higher, usually on very tall towers or on top of hills.

Antennas are the easiest way to extend communication distances. The distance calculation is based on the height of the antenna, so everyone will set the antenna as high as possible. The antennas of the walkie-talkies are made small for portability, but they come at the expense of performance. If you have a need for distance, you'd better bring a longer antenna and replace it when needed.

The height of the antenna is critical, most aircraft radios have much lower power than our ham radios at 5-8W, but it can communicate 300km with ease. Increasing the antenna height is a very worthwhile solution, it is more sensible than increasing the power. In conclusion, the higher the antenna, the greater the communication range. Mount your antenna as high as possible.

Thus, fewer obstacles, higher height and better antennas, combined with more power, will result in longer distances.