If a long length of cable is needed between a cell amplifier and antenna, in-line boosters with lower signal strength are sometimes used to extend the signal along the cable line.

**Attenuation of CM400:**

30 MHz = 0.7dB of loss per 100 feet

50 MHz = 0.9dB of loss per 100 feet

150MHz = 1.5dB of loss per 100 feet

220MHz = 1.9dB of loss per 100 feet

450MHz = 2.7dB of loss per 100 feet

900MHz = 3.9dB of loss per 100 feet

1500MHz (1.5GHz) = 5.1dB of loss per 100 feet

2400MHz (2.4GHz) = 6.65dB of loss per 100 feet

5800MHz (5.8GHz) = 10.8dB of loss per 100 feet

So, for an example, 100 ft. of cable from antenna to amplifier would decrease the 1800/1900 MHz PCS frequency by approx. 7-8dBs and decrease the 800 MHz Cellular frequency by 3-4dB. The same could be said about the 700 LTE frequency.

The Times Microwave site has a nifty little __ dB attenuation cable calculator online__.