> I got a wireless router, so I'm trying to replace my cable Internet
> cable with a shorter one (about 6 feet).
> Anyone know if this will work?
That's an RF cable.
I think you're just looking for a 5-6' Cat5/Cat5e Ethernet patch/jumper
cable from your modem to your router (shouldn't matter if it's wireless).
Read your manual and make sure you don't need a crossover cable, but I
doubt it would need to be.
Stop by your local Radio Shack, Staples, Office Depot, Target,
BestBuy, etc. and grab one for a couple of bucks.