The WHW2-xxxCC from Wainwright Instruments is a High Pass Filter with a passband from 27500 to 28000 MHz. It has an insertion loss of less than 0.75 dB in the passband and attenuation of more than 40 dB below 27.5 GHz. This filter can handle up to 30 W of CW input power and has a VSWR of less than 1.67:1. It is available in a package that measures 45 x 20 x 12 mm and has 2.92 Male/Female connectors. This filter has 7.5 mm flanges on both ends with 2.5 mm holes for mounting purposes.