This is the situation: I have a Netgear wi-fi router which has not the option to extend the wi-fi lan and two rooms in my house where it was not possible to use computers or external hard disks due to the weak wi-fi signal in there. The other available stuff I have is an Apple Airport Extreme with the right features to extend the existing wi-fi lan. After many different configuration tests I was not able to configure correctly the wi-fi lan to improve the signal and cover all my house. Then...