Hi Wasecaman.
I know the area. Lots of ex-EF Johnson people live there, many of them ham radio operators, so plenty of antenna expertise for you to draw upon locally.
I don't know if you can get KARE-11 or not. Your best bet would be as high of a tower or mast as you can get away with and a single-channel Yagi, which you would probably have to get from Blonder Tongue at a cost of $400 or so.
http://www.starkelectronic.com/btp1.htm
It won't work for any other channels so you'll have to have an antenna switch or something.
That way you could leave your existing antenna pointed at the local stations.
I reran the simulation for a couple locations around Waseca and it looks like you must be down low by Clear Lake which isn't going to help matters.
http://www.tvfool.com/?option=com_wr...ec12c814076039
If you can get the antenna up higher you will have much better results.