There are reports that Yemen is bombed by B2 bombers(Diego Garcia base possibly). If Houthis have ballistic missiles with enough range they should keep the target on diego garcia usa base and use the missiles when they find it necessary.
Karrar a2a drones should be transferred to Yemen and training should be given to them to use them(online or face to face). Karrar drones can land by parachute after being launched from Iranian ships etc. and land to Yemen to be used by Houthis. This can be a good combination with their existing surface to air capabilities. Old radars can still be used for early warning if they still have them against israeli aircraft like F15s(even F35s if older long wavelength radars or Iranian vhf radar tech transfer) and their existing IIR sensors can be used for tracking and launching sams. Radars are primary targets for cruise missiles and similar and they are continiously searched by Usa-israeli satellites. This must be kept in mind and radar should be moved continiously. Every 2 or 3 hours radar location must change to a new place.
Even if radars or iir sensors dont detect some incoming aircraft , when one location is bombed by some enemy aircraft Karrar drones can be launched towards that location to high altitude.They can be launched by rocket assist and recovered by parachute. New ones have electro-optic infrared sensors so they can find the intruding aircraft and then they can attack it be it a bomber or an aircraft.
Iran and Yemenis must think of how usa finds out about the bunker positions and how to carry some equipment to new locations as the bunker positions are gradually found out by israel-usa. By intel or by satellite pictures they seem to find possible locations of bunkers. But they still need to get close by planes to bomb the bunkers. Cruise missiles wont do the job it seems as they risked B2s to do it.
Passive radar is another item that has future in my opinion. It can use cheap fm transmitters as illuminators and catch targets while passive radar is hiding far away from those illuminators. Even if fm transmitters are hit. They can be replaced easily and won't cost loss of personnel as well. Ofcourse transmitters and the passive radar should still be protected by shorads and similar systems nearby eventhough transmitters are more numereous and survivable than active radar and passive component is more stealthy. Also fm transmitter locations should be changed periodically and rapidly.
No need to launch sams by using this radar. Passive radar will be for search-scanning and give estimated-rough areas for other tracking systems to take over and search-track targets more throughly. IIR electro-optical trackers + laser-radar rangefinder will take over after rough estimates are made. These will track targets and guide the surface to air missiles.