Depends on how high the repeater antenna is and how much power you're
running -- to hit a repeater at that distance your best bet is
probably a small beam, regardless of polarization issues.

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The main thing with the antenna is being able the "hear" the repeater, so as
long as his power equals or exceeds the repeater's power, if he can hear it,
he can use it.
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A beam would also be your best bet for general 6 meter work.

******
amen
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Six meter beams aren't all that expensive -- if you really want to
homebrew one, do a google search.

*****
Its more fun to build it yourself
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