maco m105c

Im. Trying to get this antenna to center at 28.350 but I can't get it right. Ft8 works fine 29.600 is good. Looking for dx with it. Any opinions are welcome!!attach Attached is the original instructions. Also what I have it measured too now.

I have a MACO M105C as I mentioned here. I have 5 Elements with a 26' beam. It's constructed out of aluminum. I have a fifty foot piece of coax going into the radio. The question is how can I get 28.35 10 meters? The instructions only give different options so I'm trying to tune it to this...