How about building the RPM yourself. It is quite easy here are the steps:
1. Download the ndiswrapper-1.21.tar.gz (this is latest version) from
http://sourceforge.net/projects/ndiswrapper/
2. install the package fedora-rpmdevtools using yum (small files so okay on dialup)
3. run $ fedora-buildrpmtree to create rpmbuild tree in home directory
4. run $ rpmbuild -tb /path/to/ndiswrapper-1.21.tar.gz
5. RPMS will be created
6. RPMS will be saved to ~/rpmbuild/RPMS/i686/
7. Install rpms and ndiswrapper will be installed