If you do not have a channel server and wish to serve your packages so that others can depend on them, use <uri>. This should contain a static uri that links to a single package version's downloadable .tgz
If you do not need to allow external remote dependencies, then simply use the pear.php.net channel as your package's channel.
For instance, if you wish to serve package Foo version 1.1.0 from www.example.com, use the uri "http://www.example.com/Foo-1.1.0". Note that the uri must contain the full path MINUS THE EXTENSION. Provide both Foo-1.1.0.tgz and Foo-1.1.0.tar for users without gzip.