I would like to replace the two original antennas on my WRT54G v3.1 with something of more gain. I have flashed the latest Hyperwrt file and I see where I can select which antenna transmit and which receives. My router is in a beasement and I am looking for good coverage in my second floor. I am thinking of an omni-directional antenna. My question is do I need to purchase two antennas (one for left and one for right)? I mainly use it with a Pocket PC (Dell Axim) and don't have the ability to attach an antenna to it. Any ideas on increasing range would be greatly appreciated.