wifi ethernet bridge?

[Harmon Seaver]

   I'm sure someone has done this before, but I get umpteen zillion hits
when I try to google it, and none so far have been what I needed. I'm
setting up a linux (debian) "access point" that has two Seano cards in
it, plus ethernet to my home network. Both wifi cards connect to
different remote AP's and get their IP with dhcp.  Eth0 is a static IP
on my network. I want to bridge these 3 networks if possible, and get
the combined bandwidth of the two cable modems the remote APs are
connected to. If that isn't possible, then I'd settle for just one at a
time, but so far while I can set up a bridge, I can't figure out how to
route it at all, especially since everything I read so far is for
setting it up the opposite way ( no IP given to the wifi cards and a
static IP given to the bridge, putting it on the ethernet network).