I probably recommended the MyAntennas CMC but I also remember mentioning its a good idea to borrow or steal one for testing before buying due to everyone's different setup. I have several here I would be happy to loan to locals, or I would have been happy to ship one to ridgescan to see how it works out.
In my case I was running a ZS6BKW HF antenna that needs a common mode choke and the coax/ladder line junction and I had a home made one with maybe 8 turns of parallel wires around #31 mix core. I swapped that out with a MyAntennas choke and immediately noticed the noise floor on my spectrum monitor went down a few dB and some birdies and fuzzy noise lumps were reduced. I was so happy I put a second one at the radio end where the coax exits the house and after it passes by all my computer cables and that improved things further, although not as much as the first one at the antenna.
So I have a specific problem here of RFI being induced onto my coax shield and traveling up to the antenna and the CNCs did a great job here. If you don't have RFI riding on the coax then a CMC may not make a dent in your noise floor but it definitely isolate the antenna from the feedline by 30-40dB and that is a good thing.
I also have a camera security system with shielded CAT6 running all over the roof and that system creates a lot of noise bumps and interference in the HF range. I've treated all the cameras with winding 4 to 6 turns of CAT6 through a very large snap on 31 mix bead and that really calmed things down but I still have noise here and there from some cameras. A CMC in my feedline has no effect on that noise because its radiated from the camera and the CAT6 cable as an antenna. My final fix for that was installing an Internet controlled AC switch on the camera system DVR, which powers the cameras and I turn them off if I'm operating right on a noise bump.
The remote control switch is nice because I use some of my radios remote while traveling and I can turn the camera system off remote from across the country while operating remote from across the country. There is usually a fix for everything even though it might not be ideal.
Here are a few spare CMCs I have and there are probably 6 or so in use at this location and several more at my remote locations. I love these things. And the MyAntennas tubular versions work better than any other I've tested.
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