http://www.parex.com.tw/product_wire...ard_ir9703.htm
this is the one I use £40, got it from small comp shop, never seen again though, google around to find it,
Despite being IR I can use it from any angle, I have mine resting on passenger seat with the transmitter firing into the bucket seat, the receiver is at teh top of the A post on passenger side and it gets it no problem,
I can also use it facing the boot and have used it outside the car.
I was dubious about IR to start with but this works excellently