[Elecraft] Antenna for Diversity rx

[Adriano]

Hello Ele´s

Would like to try the diversity rx but thinking about what kind of antenna should be ok for that.
For the main i use Yagis for all bands and Cage Dipole for 80m.
What should be the benefit of a 2nd antenna if i supose that the yagi´s gonna be always better than any wire or vertical or wathever?
I´m asking that cause i have to buy the ATU for that and of course it should worth the investiment. 

Tnx in advance.

PY2ADR / ZY2C