Remote tech relay satellites in range but not connecting to each other

[ilogic]

I have a remote tech relay set up at 1,000,000 m. They use Communotron 16 antennas, but for some reason won't connect with each other. Any ideas why?

the antennas are active, they have power and they have a probe core. Any suggestions?

[Geonovast]

The Communotron 16 is a direct antenna.  Direct antennas will only talk to ground stations or relay antennas, they cannot talk to each other.  If you're trying to make a comm network, you need to use relay antennas.