You should be able to use wifi tether if you root your phone. When using the EVO you get full wifi hotspot capabilities I do not not know about the hero but you should check out XDA Developers site and the section on your phone.
Once you root your Hero, if you are running 2.2 on the Hero you should be able to turn on WiFi tether and connect via Wireless Connections. If you are not, you will have to follow the step-by-step that is contained elsewhere in this forum.