The current radar we have is a kinda-sorta substitute for ground controlled interception. The problem with getting into more realistic radar is that it spawns exactly the same never-ending war of ECM and ECCM that actually happened. 110s get Lichtenstein, so Lancasters get Window so 110s get Lichtenstein SN/2. Mosquitos get Serrate to home on Lichtenstein so 110s change the antenna polarization....
Don't get me wrong, I think it would be really cool to get into all that, but I'm an electronics nerd. There's a reason nightfighters had a second crewmember - making this gear work fully occupied the attention of a skilled operator, and I already can't manage to manage the bombsight and bomber guns at the same time, much less fly a fighter and tweak my superhet gain. Beyond that, the typically large antennas had drastic performance penalties, which few MA pilots would accept. I think the poor Mossie VI already suffers enough with the night-fighting flame dampeners on its exhausts.