There has been some variety of onboard radar systems, however as far as I know, if we're talking about the 110, then only the "G" model has ever been equipped with onboard radar.
The first system to be installed was the FuG 202 "Lichtenstein B/C" and the antenna installation
for this system has always been the same, at that time considered as "large" and soon to be nicknamed "Matratze" (mattress):
The system has been developed into FuG 212 "Lichtenstein C1" which looks exactly the same and therefore cannot be distinguished from the FuG 202 from outside, only the cockpit equipment and the specs differ.
FuG 212 hasn't been deployed in large numbers as it entered service right at the time when a Ju-88 C-6 with FuG 202 B/C landed in England and the "Window" went operational, leaving FuG 202 and FuG 212 almost useless.
The next system to be installed on the 110 was FuG 220 "Lichtenstein SN-2", with the "Hirschgeweih" (deer antlers) antenna system:
This system has often times been combined with FuG 212, using a single aerial on the latter just to cover the last mile of the radar guided approach, because the longer wavelength of the FuG 220 caused a larger "blind spot" right in front of the plane:
The next step was the development of FuG 220 "Lichtenstein SN-2d" which differed from the "SN-2" by using antenna aerials with a 45° angle in order to overcome polarization effects, thereby neglecting much of the chaff noise caused by further "Window" attempts to blind later german radar systems. Furthermore SN-2d had a much smaller close-range blind spot, therefore there was no need to carry the additional FuG 212 anymore:
The final onboard radar system on the 110 was "Neptun", in it's pre-series FuG 217 V/R and the final FuG 218 V/R version. Only a handful of 110 G-4 has ever been equipped with this system and I know of no real life image showing any, however this diagram should give you a clue of the whole story:
Mike