Since the time span ebbs and recedes, i.e., loop better for a while then the vertical, then the loop. I doubt if those magnetic anomalies enter into the picture.
> Date: Mon, 9 Sep 2013 13:09:10 -0400 > From: [email protected] > To: [email protected] > Subject: Re: Topband: More anecdotal "stories" to cause one to stop and.... > > On 9/9/2013 10:33 AM, James Rodenkirch wrote: > > Listening to a fella on 80 SSB this morning about his experiences with a > > vertical 1/4 wave and a horizontal loop on Top Band. > > He said he had both up and used them over a 20+ year period and noticed > > that one would work better than the other for DX. For five years or so the > > loop would outperform, for a couple of years the two would be equal and > > then for about five years the vertical would do better. > > One can easily point to the 12 year period as aligned with the Solar Cyclef > > BUT -- when I look at the radiation patterns for both I see the loop as a > > hugely efficient NVIS antenna with little low angle radiation. Sooooo, I > > think there are some magnetic anomalies at play here but -- if the > > radiation angles don't change, how does one work "mo betta" than the other? > > > > Given the time span involved, one could also easily point to > deteriorating antenna and feedline conditions in that instance, > too..... "local" magnetic anomalies. > > Terribly tough to control that experiment data. > > 73, > - Josh / KF4YLM (operating a wretchedly deteriorated 5-year-old Topband > antenna at the moment....) > _________________ > Topband Reflector _________________ Topband Reflector
