I 'd like some info on vertical dipoles, and don't seem to be able to find a good source. Do they need a good ground system (I'd guess not, but don't know for sure)? Can they be fed from the lower end via a loading coil or tank circuit? I'd think they are best fed in the center like a sloper. If so what's the optimum impedance, 600 ohms?. Thanx for any info....WA�ITP