It will help, but only in a limited sense.
To get the most out of what you’ve got, visit www.cisecurity.org (Center for Internet Security) and download a copy of their latest benchmark for wireless networks. I was a member of the team that developed it.
In a nutshell, here are the elements:
- Turn off SSID broadcasts
- Set the SSID to as long a random value as your oldest equipment permits
- Use a 128 bit random hex key (Alpha-numeric keys only offer about 2.5 bits of randomness per character)
- Adjust the transmit power to the lowest level that will work in your facility
- Use Pre-Shared keys for authentication (not to be confused with the encryption), again using as long a hex value as allowed by your equipment
- Consider MAC address filtering, depending on the number of systems in use (only workable for very small numbers)
- Distribute the encryption key and authentication keys by
physical media (Floppy or mini-cdrom) to make entering the keys by copy and paste to reduce entry errors.
- Develop and implement a plan to identify and inventory ALL wireless equipment, and then phase out the older equipment on a budgeted, scheduled basis.
- Tie all wireless networks to a VLAN which requires VPN authentication for further inbound access.
That should get you moving in the right direction.