[narwan]

As flak units are usually deployed behind the frontline troops, try to get smoke screens between the two. You'll still be able to spot the combat troops but screened from (most) AA fire. And plan your spotting circle right, get it as far away from the suspected enemy positions as possible while still having the edge of the circle close to the area you want to see.
And always have an arty strike on the area first immediately prior to your spotting run to discourage close range aamg fire. Most vehicles with those will be buttoned after the arty hit so won't fire these.

And only plot those spotting runs if you're ready to immediately exploit the info they'll get you. Otherwise the enemy might displace and you'll have risked your spotter for very little gain.
Then there's the option of flying runs well into your own area. You might spot moving vehicles from quite a long way away and perhaps some Flak will fire at you from extreme ranges. Those won't be likely to hit your scout (eg recon by contact using spotters) but now you know a few area's to either stay away from, screen with smoke for closer looks or hit with arty.

Buy multiple spotters and combine these tactics: use smoke to screen some likely Flak positions, use artillery to strike the area your spotters will overfly, have one or two fly well over your own lines to draw (some of) the remaining AA fire and end with one or two flying over the spots you really want to have a look at and have a good chance they'll live through it.


Narwan