Here is the design of a 2.4 GHz antenna that is ideal for amateur satellite communications. This antenna is easy to assemble because the design itself tolerates inaccuracies in the construction without really affecting performance.
http://www3.sympatico.ca/b.zauhar/13cmHelx/13cmHelx.htm
Start off with two suitably sized dog tins
http://www.nodomainname.co.uk/cantenna2/cantenna_mark_2.htm
ME102 looks like it is unfriendly to external antennas since there are no sockets.
http://www.nodomainname.co.uk/me102/me102.htm
Which gain can we expect of a parabolic antenna?
http://perso.orange.fr/jf.fourcadier/antennes/paraboles/parab_e.htm
toward an ATV repeater.
http://perso.orange.fr/jf.fourcadier/antennes/pointage/pointage_e.htm
This one is more suited for 802.11 operation. It is small, very inexpensive, and the materials are much easier to work with.
http://www.nodomainname.co.uk/Omni_lowpower/index.htm
Just a quickie made from an SMA Gold baby milk powder tin.
http://www.nodomainname.co.uk/Antennas/antenna.htm
for 802.11(b or g) Wireless Networks or other 2.4GHz Applications
http://www.turnpoint.net/wireless/cantennahowto.html
It is easy to connect, requires no bulky cabling and best of all, there's no signal loss between the antenna and the PC.
http://www.nodomainname.co.uk/cantenna3/cantenna3.htm