The g5rv will give you good results on all bands down to 80 meters.  Inn
the standard configuration it is 102 feet long.  The twin lead part of the
line length is critical.
It will not work below 80 meters no how no way.  It really shines on 20 meters.
You will need a tuner.  That is, unless you live in the ideal plane.
Multi-band vees off the same feedline work well as well.
I am hearing more and more guys running closed full sized loops with
impressive results.