As a traveller, you'll honestly need to just test it out. Its simply a usb modem. The reception will be only as good as you can get based on your location. If you need something more powerful, you will likely need to go with a full on hotspot, or a customized build.
Masking the data as cellular data is up to the device, but its not likely on a usb modem, you can though change the ip information on your computer. Look up Windows/MAC/Linux "change TTL"
Antennas will be necessary if you cant seem to get good signal where you are, its always good to have the option.
Using connections while on the go is alwas tough, and depends on your own unique situation. Though you may be better off with a full on hotspot if you want something with out of box usage.
