Out of the box would not transmit.  Connect to SWR meter... zero transmit.  My CB experience spans 40 years, and I am a HAM operator.  Tried multiple (functional) quality CB antennas - ZILCH.  Sadly, I didn't use it until I needed it... and that occured past the warranty.  SO $$ wasted.  Others seem to have better luck.  Mine may have been a fluke but I did see other reviews with similar complaints.  "Caveat emptor"... buyer beware.