Here's a quick and simple Yagi design tool: http://forum.tvfool.com/showthread.php?t=1636
This thread, http://forum.tvfool.com/showthread.php?t=2865 deals with Rhombic designs which are going to be quite large when cut for the VHF band... But the 4NEC2 software used to evaluate the design is flexible and available for free, http://home.ict.nl/~arivoors/Home.htm. If you have an understanding of antenna theory, and a willingness to work through the learning curve, you can do a great deal with the software.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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