[amsat-bb] Re: 70cm Helicoil Good/Bad expensive?

Helical antennas are wonderful things. However with one caveat, they respond in "normal mode" over a wider bandwidth than the desired axial mode. What this means is that your receiver is more susceptible to overload from _out of band_ signals than it might be using a Yagi having a resonant match. Be sure your preamp is a high end model with coincidentally, " a helical" front end filter.