This might be a bit silly but….
I have a Linksys WRT54GC router with a connector for an external antenna. My HP Media Centre m7690n PC came with an external antenna that is meant to be attached to the PC for better wireless network reception.
I can’t find any specific info about the antenna (and there’s no markings on it), but it looks identical to the antennas you see with routers. Will this antenna work in the router? More importantly, could I harm anything if I just stick it on and see what happens?