[glebo]

Have you tried the good 'ol AS 2259 NVIS antenna that came with the PRC-104?? Depending on location, ground conductivity blah blah, (I'm' sure you know this) that antenna may work well.. Also, how are you're freq's propping for 24/7???

Also, as mentioned above, depending on freq spread and harmonics, a couple of fan dipoles, (oriented in different directions) which I think you've tried.

But, it's all about freq's and a good SOI to depict, depending on time of day...

good luck...