Installing a new kernel

[James Allsopp <ja@astro.livjm.ac.uk>]

Hello,
I need a new debian kernel image installing, 2.6.24>= so I can get my 
ralink wireless card up and running. My current kernel version is 
2.6.21. I have the following in my /etc/apt/sources.list
deb http://http.us.debian.org/debian/ lenny contrib non-free main
deb http://http.us.debian.org/debian/ unstable contrib non-free main

but when I try:
apt-get install kernel-image-2.6.686
it always says most recent version installed. Does this mean that there 
isn't a post 2.6.21 kernel image available in Lenny or Sid?

I've also tried download the kernel source and doing it manually, but 
the downloaded 2.6.24 source doesn't contain the Ralink option in the 
device drivers/networking/wireless section. This is present in my stock 
gentoo 2.6.24 kernel. Should I be applying some patches to it, and if 
so, could anyone explain in detail how to do this.

Cheers!
Jim