TV Antenna Recommendations for Kentucky

Denny,
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Hi, my name is Ben and I live in Owensboro KY 42303.  I'm 30 years old and unlike most of my friends I refuse to pay for cable of satellite.  We have never had anything but antenna powered TV.  Years ago I bought an antenna similar to the square sharp shooter and mounted it on top of my home.  It's been working ok, it's always been some what fussy, however we just recently got the converter box and are having trouble with it picking up some of the now digital signals.  I'm in the process of restoring an old antenna tower that I bought.  And plan to erect it in a spot where there shouldn't be an obstructions blocking a signal (we have some very mature trees near our home).  When the tower is done it should stand about 28' tall.  As with any man I want the biggest badest antenna you have; however I don't want to over kill the power if it really isn't necessary.  I like the sound of the Winegard HD 7698P or the WINEGARD HD 7084P. Do you have any recommendations?  Also what size pipe (o.d.) should be installed in the mask of my tower to accommodate the standard brackets for mounting?
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Thanks
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Ben
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