Another necessary item next time is passive radar coverage. It has pretty long range that you can use against drones and aircraft at medium high altitudes.
It may not be accurate enough to start a kill chain and guide a missile to target but for scanning and alerting other anti-uav anti-aircraft systems without getting detected or jammed it seems to be accurate enough.
For example enemy hermes drones can be detected by the passive radar over a roughly estimated position and karrar(or other potential a2a drones) can be vectored there to take down the targets by their own sensors and man in the loop. Similarly it can inform majid iir-optical guided sams to track certain areas.
Passive radar reciever sensor which is the manned and expensive part cannot be detected easily just like Majid was almost invisible to enemy drones. Fm, vhf transmitters can be detected but they are unmanned items. they can be towed-carried around by other vehicles periodically to not to be detected by spy sats. Transmitters can also be stationed far from frontlines unlike the reciever.
This leaves out low flying targets like israeli f15s flying over Syria, Iraq. For that mission a highly expensive, hard to protect awacs plane would be an overkill which also needs a large airbase. Helicopters can be converted to early warning roles. Lower detection range than an awacs but at least does not require a large airbase and it can detect incoming low flying cruise missiles drones and alert other items.
Drones can carry aesa pods for the same role as well but the range would be shorter than an awacs.
This might be the perfect solution to US AWACS drama
www.wesodonnell.com
Ideally a stealth platform should do this job but even these can be useful. They can be shot down from long ranges losing the expensive aesa radars in the process. The expensive parts are the aesa pods and processor on this drone. These pods can be dropped down by parachute with chaff when rwr activates maybe. So you only lose the carrier platform and recover the aesa radars and processing.