there are some differencies for rt73 in bt4.
1. if you want to inject you should airmon-ng start wlan0
then you get mon0 interface witch you use for injecting (airodump, aireplay...)
2. for internet connections it's all the same
you just don't use dhcpcd wlan0, but dhclient wlan0, and you'll get the ip from the router (if your router has dhcp enabled)
kismet still puts your card into monitor mode without creating mon0
be sure that your card is in managed mode when you want to connect to internet
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