Sennheiser AB 3700 Broadband Antenna Booster

Coax loses signal, and it loses more of it the higher the frequency and the longer the run. The AB 3700 sits at the antenna end of that run and adds 10 dB across 470 to 866 MHz, so the receiver sees a usable level instead of the remains of one. Fit it at the antenna, not at the rack: amplifying after the loss amplifies the noise along with the signal.

Power arrives over the coax from the receiver at 12 V DC, two feeds at up to 200 mA each, so it works with Sennheiser receivers that supply booster voltage: EM 3731, EM 3732, EM 2000, EM 2050 and EM 6000. If you would rather have the amplifier inside the antenna, the A 3700 and AD 3700 are this same booster built into an omni and a directional element.