figured someone would be interested in what the inside of a 4 to 1 antenna splitter looks like on the inside. frequency range on this one is 678-2700Mhz. I use this antenna splitter hooked to a 12dbi Yagi and running to 2 RTLSDR's. i only monitor a P25P2 system 769-775Mhz. I figured it would be more complex than this. I would have built one myself less than 150.00 bucks