ORIGINAL: tiggerinva
Form the 2004 safety code (I believe this was added for 2003):
5) I will not knowingly operate my model within three miles of any pre-existing flying site except in accordance with the frequency sharing agreement listed below in this paragraph.
Looks like if you can't sort something out with the other club then you'll need to get the AMA to step in....
If the other club is on private land The AMA can only tell its chartered club to move or risk violation of the safety code you mentioned the other club is in no way bound by the AMA or any of its rules.
Best advice is diplomacy inorder to coexisit... Might be a good idea to find out why the other club wants to be non-AMA???