What is the cheapest way to extend my home wireless network?

[SAWYER]

I use a netgear dsl modem/wireless router and on the other side of my house I can not get signal. Moving my router is not an option.

 

[Eug]

Run Ethernet? Stick a cheap access point at the other end you're done.

If you cannot run Ethernet you could try powerline networking in place of the ethernet. (HomePlug AV.)

Another option is WDS, but that is probably less reliable.