Good enough Bob. 3.03 MHz BW at the end of 200' feet of RG213 is probably not bad.
There may be an explanation for the very low frequency range.
The A/P model I just did to Tib2K's specs shows resonance at 27.100 MHz recorded at the feed point. If the antenna is as old as I suspect, then it was probably cut for 23 channels, and this was right in the middle of the band at that time. Does that seem reasonable to expect?
Bob, as noted above Tib2K's dimensions makes my model resonant at 27.100 MHz at the feed point. This antenna is not isolated (ISO). If I ISO it 4" inches at 108" inches below the hoop making my mast inside the antenna 1" x 197" inches...the resonance comes in at 26.7 MHz...a drop in frequency.
How long and at what diameter is your mast in the bottom of your antenna?
I will have to model this situation and see if I can support your claim. I suspect that ISO or no ISO come as a compromise in some way or another.
I use to make the claim that CMC's were not always bad...if you lived in the sticks with nobody within miles to complain.
I had an A99 that acted terrible on the air and neighbors and radio buddies complained of splatter. Otherwise the antenna worked great as best I could tell.
I talked to an tech engineer at Solarcon about this antenna on the phone, asking about CMC on the feed line connected to the A99. He commented, "...CMC could be a curse or a blessing, and some get out of here that work but are not soldered right. He offered to replace the antenna.
