You are ascribing fantastic properties to the SAM-6 radar. The missile has a range of over 40 miles. There is no technology that would radar illuminate a plane in a narrow beam like a searchlight over that great a distance. The ground radar is quite normal, and covers a large segment of the sky.
"The missile has a range of over 40 miles."
No. It doesn't.
"There is no technology that would radar illuminate a plane in a narrow beam like a searchlight over that great a distance."
Yes, there is. The Navy's Aegis system, the Army's Patriot system, and the Russian SA-10 are all easily capable of doing that.