I just got myself a TomTom One XLS. I heard those are one of the best. I know there are others that is good too.

Anyway, it can receive traffic information though monthly payments though Bluetooth (Cellphone) or I can get myself an antenna for it and get it for free.

I noticed the antenna, RDS-TMC Traffic Receiver, cost around $100. So before I get the antenna, I just wondering if there's a way to make one for cheaper or if there's a compatible antenna that will work for cheaper.