Debian 7: (Wheezy): http://repos.rcn-ee.com/debian/

deb [arch=armhf] http://repos.rcn-ee.com/debian/ wheezy main
#deb-src [arch=armhf] http://repos.rcn-ee.com/debian/ wheezy main

Debian 8: (Jessie): http://repos.rcn-ee.com/debian/

deb [arch=armhf] http://repos.rcn-ee.com/debian/ jessie main
#deb-src [arch=armhf] http://repos.rcn-ee.com/debian/ jessie main

Debian 9: (Stretch): http://repos.rcn-ee.com/debian/

deb [arch=armhf] http://repos.rcn-ee.com/debian/ stretch main
#deb-src [arch=armhf] http://repos.rcn-ee.com/debian/ stretch main

Ubuntu 14.04 lts: (Trusty): http://repos.rcn-ee.com/ubuntu/

deb [arch=armhf] http://repos.rcn-ee.com/ubuntu/ trusty main
#deb-src [arch=armhf] http://repos.rcn-ee.com/ubuntu/ trusty main

Ubuntu 15.10: (Wily): http://repos.rcn-ee.com/ubuntu/

deb [arch=armhf] http://repos.rcn-ee.com/ubuntu/ wily main
#deb-src [arch=armhf] http://repos.rcn-ee.com/ubuntu/ wily main

Ubuntu 16.04 lts: (Xenial): http://repos.rcn-ee.com/ubuntu/

deb [arch=armhf] http://repos.rcn-ee.com/ubuntu/ xenial main
#deb-src [arch=armhf] http://repos.rcn-ee.com/ubuntu/ xenial main

Ubuntu 16.10: (Yakkety): http://repos.rcn-ee.com/ubuntu/

deb [arch=armhf] http://repos.rcn-ee.com/ubuntu/ yakkety main
#deb-src [arch=armhf] http://repos.rcn-ee.com/ubuntu/ yakkety main

keyring:

sudo apt-get install rcn-ee-archive-keyring