I'm not sure the octagenol device I got 10 years ago was worth it; seems to trap more moths and a sundry other bugs than mosquitos. As a homeowner I've gone to using Bacillus thurengensis granules in street storm drains and other summer standing water near our house with some affect.
But neither of those are solutions for someone on the move, or close to a large body of water. For decades Tiki torches and candles of citronella have been used by many, including us, but tests I've read about indicate that's not really all that effective either, and my experience agrees; wind direction is too critical anyway I think. Some say certain B vitamins in your system will put them off, but I'm not too convinced. The female mosquitos are attracted from some distance to CO2 we exhale... reckon holding your breath your entire time outside is out of the question
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The two things that work for us are Deet repellents on our exposed skin, of course, and the "bug-off" clothing available from some retailers like Orvis and Cabela's.
-Joel