I was surprised my inexpensive CATV splitter from one of the box stores had significant port to port isolation in the VHF range. I never did an exact measurement, and have no idea how much the port to port isolation is down at the I believe 5 MHz lower limit, but I would just try one. The loss at VHF was close to the 3 dB you would expect, and some loss at SW frequencies is not usually a problem at all. Later, if really necessary, you can always upgrade to an active splitter or amp. The splitters I have are 75 ohm, which will probably work fine with typical receivers. You can get some screw on type F connectors at a box store. Most likely it will work fine below 5 MHz even with a bit more loss down there. Rick KL7CW