I tested this using my RigExpert AA-230 Zoom. I connected theDL30A directly to the analyzer's N connector using an N-to-PL adapter (no coax.) SWR was 1.1:1 or less and Ohms were 46 or better (but never reaching or going above 50. Return loss was 29dB. I wouldn't use this for any sensitive analysis or setup, but it does the job of protecting the radio and keeping off the air.