ipw2200 antenna selection

My ipw2200 pcie wifi card has 2 antennas... "Main" and "Aux". I think
either the firmware or the kernel/module is overriding my explicit
antenna module setting, after a while.

I mentioned about it a few days ago,
http://marc.info/?l=linux-wireless&m=131448481319374&w=2
although I'm still seeing the problem (even after physically
disconnecting the Aux antenna/wire. (Even after disconnecting it, I
think it is still able to receive the 30KB/s signal, and I think the
card still switches to it eventually, against my wishes.))