internet connection problems using a laptop

Hi I have a problem connecting with the internet using a hawking
antenna.
the laptop is a dell insprion 1501 running vista home basic. we can
connect to a wireless signal in the neighbor hood but can't always read
emails or surf for very long. I bought a Hawking dish antenna which is
high gain and sometimes I can connect and read email sometimes I can't.

Can anyone shed some light on what to do. I live on social security and
can't afford a cable or phone connection.


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