seems overly complicated. If you have a non-diversity receiver, just get a premium helix antenna and keep it pointed in the direction of the Phantom.
If you pair that with a matching premium pinwheel on the transmitter, you should be fine. Depending on the power of your transmitter say at least 400mW a pair like that will get you many kilometers, longer than the range of your Phantom itself.
I have a diversity receiver and I find myself usually only attaching 1 antenna. If I'm in a low interference environment I just use the Rx pinwheel. if I attach my Rx helix, it's always the stronger signal so if I'm going to attach my helix, I only attach the helix there's no point in another antenna.
If $110 is in your budget, you can get the same 3 antenna kit I did from FPVLR.. it's a Tx pinwheel and then the Rx pinwheel and Rx helix antennas I mentioned before. I can link you if you want to look into it further