How can I unzip a specific folder?

How can I unzip a specific folder with Ant?

Specifically, I have downloaded apache-tomcat-6.0.29.zip which contains the folder "apache-tomcat-6.0.29". I want Ant to unzip everything under "apache-tomcat-6.0.29" but not include "apache-tomcat-6.0.29" in the top of hierarchy.

I've tried a bunch of things, but I can't seem to get it to work.

Here's my latest attempt:

<unzip dest="${release.dir}/image/tomcat" src="${tomcat.zip}">
    <patternset>
        <include name="apache-tomcat-6.0.29/*"/>
    </patternset>
</unzip>

Any ideas?