I just recently did informal test with my rebuilt MFJ-801 field strength meter, and throw the results away by mistake. From memory, I used rubber duck as a base line.
RD with tail, some gain (about 1 line higher on scale)
Diamond ra77-ca about the same.
Diamond with tail another incredment higher.
Comet bnc-24, same results as Diamond.
MFJ 1/2 wave long ranger pegged the needle hard enough I could here it at 20 feet.
Plan to re-do it and also check out yagis as well.
Malen
VE6VID