The cable amp is a small signal amplfier, not intended to drive a 50 ohm load at any great power level. With that said, The cable amp works good for 1-5 MWs dirve, that is if you want to also amplifiy harmonics up to 1000 MHZ. The radio shack 20 db amp works best when using a couple of MW in as you can get about 20 MWs out of it. If you modify the power supply by putting in a full wave bridge, (taking out the one diode thats in there now,) you can get at least 3.5 volts RF out across 50 ohms with 100 MHZ drive at 5 MW in. This translates into about 250MW on the output, If you replace Two peaking coils in the amp with two ferrite inductors you can hit 300 MW into 50 ohms. Is it worth it, well I guess thats up to the end user, you will have a lot of harmonic amplification, so you need to filter well. If you use the amp with just a short antenna for around the house, it will work good for the application