I can see tcas all day at work but as a hobbist I'm looking at the Radarbox and SBS-1er. What I can't figure out is why do these boxes cost so much? It's not like they are certified FAA approved install on aircraft? Why so much and where is the competition or the DIY kits? I appologize if this has been asked before, if someone could link me to the answers I'd appreciate it. I mean $600-$700? Really!!?? There has to be a better way to market a cheaper version like $200. It's not like dealing with a digital scanner, you are basically getting a receiver with 1090mhz (ONE FREQ) a host controller and data usb out. Your PC does the rest. Show me a laptop with Radarbox package then you have $700.00. Sorry for the rant but there has to be a cheaper way.