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Knowledge Base

What is the maximum length of a coax cable used in a cell signal booster system?

Cellular and other types of radio and microwave signals attenuate (lose strength) as they travel through a coaxial cable. The longer the run of cable, the more attenuation the signal will experience. Because of this, coax cables used with cell signal boosters can only be used in limited lengths.

The general principle is always use the shortest run of cable possible.

Powerful Signal recommends these maximum coax cable lengths between the outside donor antenna and the cell signal booster. Beyond these lengths, the attenuation will probably prevent the booster from being able to effectively amplify the signal.

Cable type
Strong outside signal 
Weak outside signal 
½‑inch
200′ (61 m)
100′ (30.5 m)
100′ (30.5 m)
60′ (18.3 m)
45′ (13.7 m)
30′ (9.1 m)
240, 200, 195, RG58
30′ (9.1 m)
20′ (6.1 m)
100, RG174
15′ (4.6 m)
10′ (3 m)

Consult the manufacturer’s specifications and guidelines for your specific cell phone signal booster model to determine the recommended maximum cable length.

If you’re unsure of what cable and length to use in your situation, please contact us and we’ll be happy to advise you.