In a word Junk. I bought this guy because it was a wham bam install and to say the least I was going to be as lazy as possible about it because I wanted to get on the air, not spend a whole day drilling holes and planning stuff. And it was CHEAP.
I know of people who have had them work just fine. I can tell you they are definitely not the old K40 of the 70's. I know of some of them still in daily operation.
I finally got my Cobra 29 LTD unvandalized and running correctly. Then I was peaking the radio and the SWR started nailing the corner of the meter. WTH?
After about 1/2 hour of testing and messing with it and replacing the connector I found that there was a 1 yep 1 hair from the shield crossing onto the center lead in the base across the load connections.
IMHO - The K stands for Krap and the 30 stands for total number of days before it dies.
I had pictures in my head of some guy in a foreign country putting this stuff together saying " Ha, stupid fat American red neck, I kill your radio"
Sadly - there is next to nothing in the base of this antenna?? I don't know what I expected for $30. But the sweet cheapness is quickly countered by the sour disappointment.