It struck me the military communications equipment table in AToW (page 301) was missing something between the "Field Communicator" and the "Field Communications Kit, Advanced" (which is only available to ComStar). This is particularly odd because there is a Civilian "Communications Kit, Long Range". To remedy this, I propose the below.
ITEM EQ. RATINGS COST AFF MASS RANGE POWER USE NOTES
Field Communicator, D/B-D-C/B 500 - 6 KG 100 KM 5 PPH 2,500 KM RANGE TO SATELLITE
Long Range
I added mass to reflect additional signal security (e.g., frequency hopping, encryption, etc.) and range (twice the civilian model). Of course, both of those also require more power.