My landlord recently installed wireless internet service through Telmex (my current service is through MegaCable) but neither of my laptops have been able to detect the network. Consequently I have been doing a bit of internet research on extending the reach of my laptops WiFi antennas.
I ran across a plan for this home made antenna and put it together in about five minutes. I am now able to detect the apartment building network. The antenna consists of a USB WiFi antenna mounted in the center of a six inch kitchen sieve and connected through a USB cable to the laptop. I plan to try a larger sieve as the six inch model is very particular as to its placement.
The USB WiFi dongle was $400 pesos, the sieve $6.60 pesos, and the cable $85. pesos. So the whole set up was about $45. USA.