Choosing to omit the reflector is a very significant modification of the original design...
A successful antenna build requires some degree of precision. In some cases, modifying a dimension by a milliliter is significant. Omission of a reflector can drastically alter the resonant frequency of the driven element(s) and also radically change the impedance of the entire antenna.
I'd recommend http://www.digitalhome.ca/forum/showthread.php?t=121956 and http://clients.teksavvy.com/~nickm/index.html as a starting point for reliable information re. the current development of the GH series of antennas.
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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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