[OFARC] Questions about antenna tuning

[Don Davis]

Hi to All,
I'm only a 2-year-old at this hobby, so I hope y'all can help with this:

My first HF antenna got destroyed by the derecho. So, before the hurricane came, I took down the new MFJ 1836H cobweb 40-6M antenna. I recently installed it back up again and retuned it about 7 feet above ground. Raising it up on a mast about 20 feet above ground changed some of the SWR readings. Anyway, I have attached a spreadsheet of the readings on various bands. Notice the 6m and 10m bands have high SWR readings especially at the low end of the band and the high end. Also, the low end of the band on 15m is high. Since I have a general license, I used those frequencies as a band plan, trying to tune at the center frequency. I used an MFJ 269 antenna analyzer. Are these values too high for an antenna tuner? Is this to be expected on 6 and 10M bands?  I don't understand why the high edge of the 15m band has a high SWR? Do I need to retune these bands?
Thanks to all for your help,
Don KI5WWD
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