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It does sound very odd that you can hear clearly and but they can't hear you. Are you sure the person you are talking to is not just taking the %$#*. Is it with the same person everytime. Do they know how to use their gear. Is the problem with their gear. Even a little cheapo handheld is going to be able to go 20m in most situations.
If you are convinced that it is a problem with your gear the next step seeing as how you have already done the antenna (you did get the correct type for the terrain and ground indepedant?) is to check the coax. One of the connections might have come loose or they might not have been done properly in the first place (it might pay to do some fresh connections) or it might have gotten damaged somewhere.