While the size of this beast can compensate for lack of multiple antennae, nothing compensate for flimsiness of an on/off switch.
First, the way switch is design, it will definitely turn on when you do not want it on (in backpack, car trunk, etc). On the other hand it will never turn off by itself, but I am sure one can design the switch that works both way.
Second, switch broke after one day touring. It was in on position, but beacon was not transmitting. This is the worst you can expect from the beacon.
I returned the item, and ordered a replacement. Hopefully this is just a random glitch with my unlucky unit.