Using an EDVO card you would need a special router for 802.11b/g networks wireless devices to access the Internet and very expensively
Kyocera KR1 3G Mobile EV-DO to Wi-Fi Router
Go to Kyocera site and download the user manual and take a read
3G Phoebus Portable Cellular Wi-Fi Router
Cellular (CDMA, EVDO, GPRS, EDGE, etc.) to Wi-Fi Hotspot Router
3G Mobile Bridge (MB8000)
Download the documentation and take a read
Base on the distance between the buildings; you would need to install outdoors hi-gain
Directional antennas for each building
Plus you might need to install Wireless-G Range Extenders in each building to cover
areas that require access
Hawking Wireless-G Range Extender
D-Link ANT24-2100 21dBi Wireless Network Antenna - Directional High Gain
High Gain Wireless Antenna
High gain wireless antenna often needs proper site surveying before a decision can be made upon which antenna to select.
High gain wireless antennas come in various guises.
The directional, omni-directional, corner, as well as antenna suitable for outdoor use as well as the standard indoor variety.
Each classification of high gain wireless antenna has a different specification when it comes to the wireless beam, the vertical and horizontal measurements can vary quite considerably.
This statistic makes it incredibly important to research you requirements thoroughly before purchasing an antenna.
It would be a lot simply and costly just to install a phone line in each building with a normal wireless modem router