I thought the pattern from that sort of antenna was more of a doughnut shape, which means directly above the antenna would be one of the weakest places in the pattern
++++++++++++++++++ Correct = the propagation pattern (in section) for a whip antenna is like a squashed heart shape with the lobes either side of centre - weakest signal is right in the centre along the line the whip is pointing. From above it is a doughnut. We took that into account, IF the distressed airplane was still right way up, there would be two peaks on each pass. By the time we found the signal and moved down to 1000 agl that became academic. Point was (is)- give your ELT the best possible chance of getting help for you by optimising the antenna installation. Take care Steve J
