Seen a video last night with same Ikelite antenna setup as yours with a Yuneec H Plus, comparison between stock antennas vs. the Ikelite antenna. Almost doubled the range, not sure how it would work with Evo 2 Controller.
My recommendation, instead of switching to the Ikelite antenna, I’d go with a set of Titan Whip antennas instead. That’s if you’re trying to keep this low budget, that’s probably the best direction to take.
With my Evo 2, Whip antennas do increase range and reduce inference. Equal to Mavic 2 Pro osucsync 2, that was my experience.
Just my two cents worth, not sure if Titan still sells the whip antenna setup with the antenna cross member as a pkg. They probably still do, in case they don’t supply the antenna cross member you can make your own.
Good luck, Keep us posted how everything turns out for you. I’ll attach a couple of pics, Whip antenna setup. The cross member, first drawn to paper, then cut and retraced to an old black plastic DVD jacket.