Radar performance has improved substantially from the first prototypes until current modern systems. Nowadays, technical advances run parallel to the development of new materials and shapes able to shield different targets or even make them invisible to the radar. This paper introduces the shielding phenomena from another point of view, dealing with the usage of forested radio propagation channels to degrade radar performance. Based on measurements carried out in five different forest and meadow scenarios, we study the probability of detection of a target located within such environments. Depending on the type of target, the frequency, and the vegetated surroundings, we demonstrate that a forest can provide radar invisibility even to large targets, reducing the probability of detection to values below 0.1.