ATV 2 won't detect network created on iMac

Hi,
I have an ATV 2, which detects the wi-fi network just fine. However, when I create a network on the iMac (which is connected to the internet through wi-fi, not ethernet), the network just doesn't show up in the list of networks. Even when I type it out in the search box it doesn't detect. I am creating a basic network on the iMac (Channel 11, without a password). Am I doing something wrong?
Thanks.

Welcome to the Apple Community.
My guess is (and that's all it is at this stage) is that you might be looking at the wrong side of the process as being the problem. Have you considered this might be network related, most network problems are interference, have you checked and/or tried another wifi channel.
You might also try restarting the Apple TV be removing ALL the cables for a few moments.

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