I'm not sure if that's a typo in your post (Edimax do a 7728Ln which is a PCI card, not an access point), but I'm using some Edimax 7228AP devices in my network. Is this what you've got?Has anyone tried ethernet wireless repeaters - my Edimax 7728AP has this capability, but I cannot seem to get it to cooperate
If so, the 7228AP can indeed be set up as a repeater. But I wonder if you've considered using it in "station-infrastructure" (their terminology) mode? This means that the Edimax becomes a wireless client itself, and then anything you plug in via the 5 Ethernet ports is therefore bridged onto the wireless network. This way, you can have the Humax cabled in - which avoids having to configure the Humax as a wireless client in its own right.
For what it's worth, I'm running a Fritzbox router on 802.11n with WPA2. Then I've got two Edimax 7228AP boxes set up as "station-infrastructure"; one for the Humax, and one for a Raspberry Pi media server for streaming from the Humax. Bunged a couple of high-gain antenna on the Edimax APs, and it streams HD from one side of the house to the other, totally wirelessly, via the router in the middle.
So I'm reasonably impressed with the Edimax as wireless clients. I know some "pre-N" vendors have incompatibility problems, and yet they're working reliably with a router from a totally different vendor (although the Fritzbox isn't compatible with them if you're using WPA2 on WDS - which I'm not).
Hope that helps - it's another option for you to consider, anyway