i did a little lp locate this morning and was putting my tools up and i heard a rattle, same rattle i have been hearing for years. i got my dynatel second hand years ago, the antenna always had a rattle in it sooo, i decide to take a look see. very interesting circuitry, the horizontal coils are peak antenna, the vertical are null antenna, the upper and lower circuit boards have me bumfuzzled at the moment. the rattle is a 5.185 mhz filter, i don't know if i'll solder it or farm it out to someone that does solder work as a professional. damn right it gets farmed out interesting thing is that the dynatel work great as it is, with the filter back in place maybe it'll work greater.