The RU-1:1 is a 1:1 Unun intended to help remove unwanted RF from the coax cable shield. It is normally used as a common-mode RF choke for short coax cable runs or non-resonant antennas. The RU-1:1 features SO-239 sockets for both input and output. * Configuration: 1:1 Unun * Frequency Coverage: 1.8 to 30 MHz. * Power Range: to 200 Watts PEP * Easy to weatherproof * Enclosure size: 5 x 2.5 x 1.25 (measured in inches) * Weight: 6 oz (with enclosure)