A way to hide yourself from a radar broadcast is to fly as low to the ground as possible. This is called "nap-of-the-earth," or NOE flying. When you fly extremely low to the ground, a radar may get confused and think that you are part of the landscape. While NOE flying is quite effective in avoiding radar, its disadvantage is that it makes your plane very vulnerable to AAA and small arms fire from ground troops.
He used NOE flying to drop off illegal goods to the dealers.