I have two buildings. Building A has wifi (2.4GHz) infrastructure, Building B doesn't. One side of building B can pick up the wifi signal from building A. I want to passively extend the signal through to the rest of building B, using two antennas and a short piece of coax.
Supposing I put a decent directional antenna (24dBi) in building B, pointing at a WAP in building A, then joined that to an omnidirectional antenna with a short (50cm) piece of coax. In this scenaria, for the omni antenna, would it be better to have a large (e.g. 12-15 dBi) antenna, or a small one (~7 dBi) (assuming the smaller one can still cover the range of the building)?
I am aware an active repeater would be better, but I'd like to get some thoughts on this scenario.
EDIT: background reading: http://www.netscum.com/~clapp/wireless.html#passive