My understanding is that if you double the length of the g5rv it will work on
160m. With the standard antenna, you can short the ends at the ladder line and
get the same effect. I believe it just works better for 160-40m by doubling it,
especially for 160m.
Tom
Tom Brennan KD5VIJ, CCC-A/SLP
web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html