On call and wireless broadband cards...

My current role does not require on-call responsibilities. When I did provide off site and oncall user support to (nurses, docs, lab techs, resp therapists, any and all clinical) users I had access to the organization's VPN and proxy software loaded on both my stationary PC and the organization provided laptop (which did have a wireless network card). I want to say we got a deal on wireless cards from the same company that provided service to our mobile phones, pagers and blackberries.
Hope That Helps

Wireless connections can be encrypted with 128bit technology. The fire department where I volunteer uses encrypted technology for mobile dispatch via computer and for comm center communications. Done via a cellular modem and special encryption software. We don't have the 2Ghz coverage to adequately in our district to use that, but the technology is available if you can use it.

Our facility has wireless repeaters set up throughout the hospital. I can get a connection to the network with my laptop, but I can't see any machines or files, nor can I get through the firewall to the outside.

In short, wireless is secure. Trick is to get the higher ups to pay for it.