Multiple Internet Connection Sharing (ICS) Hosts ?

I have 3 computers on a Gigabit LAN. Two of these have wireless connections
to a router and then the internet. The router is too far away to physically
connect to the LAN.

I know that I can set one of these computers to be the ICS host and the
others can use his signal to get onto the internet. However, this means that
3 computers will be sharing a small bandwidth for the internet.

Is there a way to connect both of the wireless connections to expand the
bandwidth?
Can the 3 computers share the bandwidth of both connections?
Can a single computer use the bandwidth of both connections?
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Thank you,

excelBRISKbaby