Currently using a Technicolour TG589vn v2.  The WiFi connection between iMac and Apple TV is the major issue.  We have an EXTREMELY flaky internet connection due to the whole area requiring recabling.  The problem I am experiencing is that when the internet connection is playing up, the connection between the Mac and Apple TV is compromised, so you can probably understand my frustration.

A) What WiFi settings do I need to adjust to prevent local connections from being affected by internet connection issues.

B) If my modem/router is not capable of maintaining a stable WiFi LAN environment irrespective of the ADSL connection, what other device should I consider using?

C) Would using LAN cables through the device be more effective?

Thanks in advance.