Need longer range?

The CTR-350 mobile router has a built-in WiFi antenna. It works fine for its intended purpose, but you're not going to set any records for maximum WiFi range with it.

Now that the Ethernet port of the CTR-350 can be used on the LAN side (as of firmware 2.0), it should be possible to attach another WiFi router (set to a different WiFi channel keeping mind the overlapping channels, [use 1, 6, etc.]). So the extra router could be equipped with an external antenna in the usual fashion to achieve whatever range you care to attempt.

The 595U has an antenna jack for extending the EV-DO range if required.