I found a neat trick on Frontline.

Get a tank between G1 and G2 and roll backwards up over the little mound at the back of the map and hide.

You are protected from direct tank fire and can lob shells into town and the large field area between G2 and G1.

Basically nobody can come down the hill without you hitting them. Also, there is quick access to the tunnel 100 yds away.

p.s. The aircraft fly over every 1:30, so if you are in spec at the right height, they fly right by your head at 300 mph.