So as to adapt an antenna arrangement for RF-signal transmission in a hearing device to different needs of different types of signal-transmission, the bandwidth BW of the antenna arrangement is manually andor automatically adjusted. The insert 30 also comprises a tool 38 which is demountably coupled to the distal end 36. The first arm extends outward from the hose toward the second arm and the second arm extends outward from the hose toward the first arm. A portion of the water discharged through the nozzle passage is forced and guided downwardly along these ramps for enhanced close-in distribution of water near the sprinkler. The method includes a step for determining whether the first data frame satisfies at least one predetermined condition based on at least information associated with the first data frame.