Best encrypted, or at least use point-to-point adhoc in bridge mode rather than point-to-AP unencrypted, which will surely get abused.
quite available in Poland where people have unencrypted AP's at home. good antenna and you get free (and anonymous ;) access to the net.
easily. With +15dBm antennae you should get (at least lower) 11g rates, and if you can afford 20+dBm dish grid antennae, so much the faster.
grid antennas for 2.4Ghz are not expensive. give best available there are about 24dB, to have LARGE margin for noise.
As others have said - avoid amplifiers, spend most on good antennae and
amplifiers make sense ONLY when there are something on the line that damps the signal (like few trees) and you can't avoid that. but still it's not good, snow would fall on trees and then nothing will help.
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