Have you tried making your own, for drone applications including Solo? I did some searching and all I could find was cloverleaf-making instructions, but I haven't seen those effectively used for these types of drones at the ranges many people are looking for.
No... the whole reason I have a solo is that it's a one man device.
I've got a small arsenal of 2.4GHz antennas in my garage... but 90% of the time I fly with the stock antennas... you cant beat the forgiving 'fat lobe' of a basic 3dB dipole antenna. (although I am using the microtik cards)
As pedals said above, solo isnt really the right platform of ultra long range stuff... Dont get me wrong, I love the Sololink concept... for it's intended purpose it's still the best thing out there, but 802.11 wifi is just way too fragile at range.
As for cloverleafs, the theory kinda works... circ polarisation effectively has 3dB loss regardless of the antenna polarisation at the other end. cross polarisation however (ie horiz to vert) will result in up to 20dB loss. So you could make the argument that a low gain cloverleaf with 3dB polarisation loss is better than a 5dB panel antenna with 'possibly' 20dB polarisation loss.
Downside: gain is very low
Upside: lobes are fat and forgiving