Another problem I have is that Delphi chose to use two different types of antenna connectors, but only the wearable antenna (which doesn't seem to work for me) can be directly plugged in to the MyFi.
The vehicle and home antennas can only be plugged in to their respective base adapters and not into the MyFi radio itself. Using the base increases the radio's bulk by about 30% and, I think, greatly affects the portability of the device.
If one of the land-based radio stations is broadcasting on or near the MyFi sending frequency, the reception will be poor with lots of static. I took a 400-mile trip and only had to change frequencies once when traveling through a city with an FM station that interfered with the 88.3 megahertz signal I was using.