Thanks to an anonymous comment on
this post about the Android HT, I present the
Runbo X5. The Runbo X5 is a ruggedized Android mobile phone with a built-in UHF (400 - 470 MHz) radio. Clearly, this goes well beyond the basic Android HT we were considering given the mobile phone, IP67 rating, etc. and the price goes up accordingly, but now we have an example of one Android HT implementation.
My Russian is as poor as my Chinese, but I think
this post may be correct - the antenna is for the UHF radio, not the mobile phone functionality.
Here is some translated commentary
from a review of the previous model, but I think we get the gist of the UHF "intercom" capability:
"Intercom function is a feature of the Runbo X3, no cell phone, no cell phone card case, within a distance of 3 to 5 km, free flowing intercom, the signal is clear, open distance greater than 10 km . The intercom function is all free, ALICE can freely travel are between the timely sharing the joy of the journey."