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Loosecannon, I would suggest you listen to 821. Don't make too much about needing a balun either, unless you end up with a very bad antenna and the problem is actually related to feeding. The M-103 uses a gamma match and this device is not so prone to problems that will require a balun. The M-103 design also has been pretty well tested and if setup vertical it should show a modest gain over a good working vertical ground plane.

 

I am surprise that you feel you need some additional gain in the very modest range that you mention however. Within this very close range you should see some modest attentuation at points around your station, but it won't be like day light and dark. You should still be able to communicate within a full omni pattern at this short range whether you set it up horizontal or vertical. It's not like you will never see an exception in this regard, but these directional and attentuating affects of a small beam are just not as pronounced as you might think.

 

Good luck and keep us posted.