Just get a linksys wireless router and you are set.
When you are out on the patio you can surf to your dial up connection.

try a company called wiflyer its a little pricy but it has an all in
one modem/wireless router also acts as a travel router

dial up is very slow and may not give the speed for a wireless
connection.

This is true. And because of the time between the computer making a call
to a site, the transmission time to the router, through dialup and then
the return trip, using dial-up with wireless may actually be even slower
than a direct dail-up connection. But it can and is done.

If your dial-up isnt a solid 50 connection, meaning if you are only
getting dial up speeds of 30 to 45, then I wouldnt try it. The one I did
last week was a good dial up connection and was getting 50 every time.