I've successfully been able to use rtl_fm with multimon_ng on Mac/linux. I have both utilities on my Windows computer also. Unfortunately, doing a conventional DOS pipe doesn't seem to send the data properly to multimon. I can output rtl_fm to a file, then read that file in with multimon and it decodes just fine. But it cannot pipe data from rtl_fm to multimon as multimon complains that it doesn't have an input file. I've tried a variety of DOS pipe/redirect tricks trying to get it to accept the input but it just won't work. Has anyone had success with this? Thanks!