My father was a navigator and EWO officer in the C130 Hercules during the Vietnam war. He didn’t talk much about the war but one of things he told me was that

My father was a navigator and EWO officer in the C130 Hercules during the Vietnam war. He didn’t talk much about the war but one of things he told me was that while he was that their aircraft had several stubby antennae around the aircraft that monitored the radar from ground to air weapons. He said they had various jamming equipment and would send back radar signals out-of-phase so that ground radar would receive strong signals where they should be weak to throw off the targeting. He said at one point over Cambodia his equipment was overloaded by being locked on by multiple Chinese made weapons. Later analysis showed at least 3 different “Firecan” radar locked on. Luckily they were not fired upon. Edited to add that Wikipedia shows that Fire Can as Russian made. But my father did state he thought they were Chinese made