Recently I was looking for a low budget antenna to use indoor just so I could monitor the local 2m and 70cm repeater.
It had to be an antenna not taking to much space, that I could build with parts that I still had lying around, but nevertheless still had a good SWR so I could transmit on it as well.
After some searching I came across this dual-band J-pole antenna and gave it a try, these are the construction details of it:
I have to say its a very nice antenna that although mounted inside almost against a wall still has an very good SWR on both bands