The RG400/U from Pasternack Enterprises Inc is a RF Cable with Frequency Range 12.4 GHz, Cut off Frequency 12.4 GHz, Propagation Velocity 69.5%, Attenuation 4.4 to 57.9 dB/100 ft, Capacitance 32 pF/ft. Tags: Flexible. More details for RG400/U can be seen below.