I threw together a junk bin L network antenna tuner. The inductor is wound with solid core 14 gauge wire. The variable capacitor was scrapped out of an old (non working and not worth anything) tube AM radio. The coax connectors were scraped off a couple of junk CB radios.
The capacitance range isn't quite enough with the variable capacitor so I had to add capacitance by sticking a capacitor in parallel on the breadboard. I'm usually able to get the SWR down to 1.5 or less on the G5RV antenna using my FT-900's internal tuner to do the rest.
Eventually I plan to buy a couple of larger variable capacitors and make a nice T network version that will hopefully perform better. However I was able to get on the air with my new G5RV with parts I had laying around.