@dboomer,
Actually such things DO exist, but they are not cheap. They are called digital repeaters, digital re-clockers, and digital distribution amps (each is different, but all of them can help with the problem of driving digital signal over extended cable lengths. Just search "AES/EBU distribution" Google Shopping to see a number of different ones.
@kjellarne,
AES/EBU spec cables should be good over 100 meters. The specification says 150m, so just by a longer cable! https://tech.ebu.ch/docs/other/aes-ebu-eg.pdf
Please note Three 50m cables strung together are not the same as a single 150m cable. Each connector adds "discontinuity and mismatch" which degrades the digital signal, so make each single cable as long as possible and use the fewest connectors along the way. http://www.sweetwater.com/store/detail/EBU100
Enjoy LIfe! B)