I've built a 2 meter ground plane antenna that works pretty well for RX and has a decent SWR on 2 meters with my Alinco. However, I'm experimenting with SDR quite a bit and would really like to build something for weak signals, especially CW and RTTY at less than 50 MHz.
To that end, I was thinking of building a large dipole, but I'm getting advice that says that an ungrounded end fed wire run up the side of the house would likely perform far better.
First, is this true? Second, if it is true, why is it true?
Note: I am planning to use this antenna for RX ONLY, so I'm not really concerned about frequency matching on the length of the wire or dipole arms.