Henry, I've heard similar advice before, but here is a strange story I personally experienced with chokes. It makes me scratch my head and wonder.
Before I had to stop working with my real antennas, I put up my Sirio New Top One on a mount right outside of my shack. I had it installed at 27' feet to the hub.
Almost right away I found out this setup was producing TVI. So bad in fact that it would disconnect a TV in my family room that worked off as a remote, hard wired to a Comcast modem. I had to pull the power plug on the modem for it to reset.
I had never noticed any problems before with this particular antenna, but I always had it up about 40' before. I let it down for some bad weather.
Well, the story is I had the excess coax on the ground and one day I went out to secure the coax as the lawn guy was here to cut the grass. I rolled it up in a 12" roll as best and as net as possible, and hung the loop to a guy bracket on the PU pole and let it just hang there.
Later I discovered the TV worked fine while I worked my radio. I took the coil down and put in back on the ground after the lawn guy left...and the TVI was back again, worse than ever it seemed.
Two things I thought about.
1. I had it laying on the ground figuring that would help if I had RFI/TVI.
2. I strapped the choke, as it were, directly to the mast, a serious no-no as I understood at the time.
I've always had unpredictable results with chokes...and for the most part I never use one.
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