I second the opinion about log periodics. They really come into their
own when you are trying to cover 3 or more bands, but it takes a lot of
LP aluminum to equal a 3 element Yagi for gain.
You could build a couple of Cheap Yagis on a single boom (2m at the back
and 70 cm at the front - the 2m signals won't see the higher frequency
antenna at all) and couple them to a single feed line with a diplexer.
Comet makes a few with tolerable advertised losses, though they are not
weatherproof - you might be able to do better. If the boom ends up too
long for transport you could make it in two pieces which could fold or be
taken apart.
73,
Steve VE3SMA
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