The SdKfz 251/3 seems like a good addition; I like the idea of a command half-track. While the frame antenna is very iconic, it disappeared from command SPWs from about 1942.
The "star-shaped" antenna is called a "stern antenna".
The "frame" antenna is actually called a "NVIS antenna". NVIS stands for "Near-Vertical Incidence Skywave". It is a high-frequency (HF) antenna, commonly referred to as a "frame" or "cage" antenna. There were multiple variations depending on the vehicle, it was used throughout the war for both ground to ground and ground to air communications.
I am not crazy about radios, but here are some additional information on WW2 German radios:
FuG1 was a listening set normally put in command vehicles.
FuG2 27200-33300 Kc/s with 1.4m rod was the standard listening only equipment for subordinate armored vehicles.
FuG4 was an artillery command set with a 2m star aerial.
FuG5 10w transmitter operating at 27200 to 33300 Kc/s with a 2m rod aerial giving range of 4km morse and 2km voice--standard tank set
FuG6 20w with same antenna and operating Kc/s but 8km morse and 6km voice--early command vehicles
FuG7 20w with same antenna, operating on 42100 to 47800 Kc/s with a morse and voice range of 50km--this was the ground to air set normally found in the SdKfz-250/3, 251/3 and command tanks equipped for air to ground.
FuG8 30w operating in the 1130-3000Kc/s (version a) or 580-3000 (version b) and 835-3000 (version c). Early and mid war had the big frame antenna but late war used a 8m winch mast antenna. 40km morse and 10km voice with the frame antenna. 50km and 10km with the 8m mast. This was the main division set.
FuG10 is a 30w set operating in the 950-1670Kc/s (version a) or 100-6970 (version b) and another version using 1120-3000Kc/s using a frame antenna. Range is 40km morse and 10km voice and was used in recon vehicles.
FuG11 100w operating in the 200-1200 or 100-6970 with early versions using a frame antenna and later versions a 9m mast. Used as command link to recon units and notably the SdKfz232(Fu). Range was 50km morse and 10km voice for the early frame antenna. The 9m mast gave a range of 200km morse and 70km voice!
FuG12 is 80w operating in the 1120-3000 and receiver in 835-3000 using 2m rod giving range or 200km and 70km used by late war recon vehicles
FuG13 was for 20w same as FuG6 but with 2 receivers and used in lower level command vehicles
FuG15 operated in the 23000-24950 Kc/s and used by assault gun units. range of 8km and 6km.
We will continue to work on additional variants when we have the free time. No definite release dates though...