How do I improve Airplay mirroring? (iMac to AppleTV)

Airplay Mirroring was working great, and then the display quality really went down.  Text used to be quite clear, but now it's almost unreadable.  Nothing had changed with my setup, so I'm not sure why this is happened.
Things I've tried:
1. moving my router
2. using ehternet rather than wireless on AppleTV
3. switching to 5GHz network
Any ideas what might have happened?
hardware:
iMac 27" 2.7 GHz Intel i5
latest AppleTV
most up to date software on both

It might have been the last appleTV update.  I can't recall when the update came out...
iMac is almost idle.
I ran iStumbler, and my signal is at 69% with 9% noise.  There are no new sources of electromagnetic interference. 
I'll add that when use airplay mirroring with my iPad2, the image is perfect
Thanks

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