A quagi type antenna seems to be close to what you want.
Try these links:

http://www.geocities.com/garyntricia/quagi.html
http://commfaculty.fullerton.edu/woverbeck/quagi.htm


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Asimov wrote:
Hi,

Just wondering what adding horizontal parasitics to a UHF loop does?

A*s*i*m*o*v

... "If it ain't broke, you're not tryin!" - Red Green