You can install the SRPM and then rebuild on your particular release of Fedora:
rpmbuild --rebuild aprsdigi-3.5.1-6.src.rpm
sudo rpm -Uvh rpmbuild/RPMS/x86_64/aprsdigi-3.5.1-6.x86_64.rpm
(exact path names may vary depending on how you set up for RPM building)
I've been hoping to get it added to the Fedora-hams distro but I lack the time to learn how to become a Fedora maintainer (I actually did start the process). I would appreciate it if a Fedora-hams maintainer would be willing to help me.
73 de Alan N2YGK