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Cisco has a utility to calculate gain and loss of RF for their bridge. You can use that to find out how much gain you will get after 50 feet of cable if you know all db info of your device, cable, antenna.
I believe WRT54G should be able to alter for outdoor use if you can spend time. But, you can put an outdoor wireless bridge at your roof or another AP/wireless router on bridge mode at attic (with good ventilation) to get outdoor performance without running long RF cable.
Good luck!
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