RE: Frequency channel communication problems
Most likely they are an AMA club. AMA rules require that a club that's relocating negotiate frequency sharing with existing fields that are within a certain distance. If you're not going to join them, you should be able to negotiate exclusive use of your channel. Of course you might also be able to negotiate free membership as long as you live at that house. Having a member so close to the field would be a bonus for any club. Work with them and you should be able to end up with a win win solution for everyone.
Send a letter to the club president and copy the person at the AMA who is in charge of helping with field acquisition. Don't demand anything, just let them know (in writing) what channel you are using and ask that they work with you to come up with a solution that works for everyone. This will establish you as the existing user of that frequency in that area. Leave the solutions out of the letter. After talking you may actually come up with a better solution.