The M17/128-RG400 from MegaPhase is a RF Cable with Frequency Range 0.3 to 50.0 GHz, Cut off Frequency 50 GHz, Propagation Velocity 0.69, Cable Diameter 0.034 Inches, Attenuation 0.327 to 4.565 dB/ft.. Tags: Semi-Rigid. More details for M17/128-RG400 can be seen below.