Back in the pre-GPS days of boating we used loop antennas (just an antenna doubled back on itself) as radio direction-finders. Strong signal with the antenna sideways to the transmitter (a ground based source), weak signal when end-on. By turning the 360º calibrated dial and taking a reading, then taking a second one a known distance later, you can triangulate the source.

On a R/C aircraft, a looped antenna might allow you to fly very well downrange, but when you made a 90º turn you would find yourself out of contact with your airplane.

If HiTec offers a bobbin I would guess they have tested it. Another solution is using CA to glue a plastic or glass bead on the antenna tip and pulling it in for display, but out for flying. But that is just another thing to have to remember. I lead mine out of a piece of fuel tubing behind the wing or canopy and to an elastic snubber on the rudder tip. It doesn't look too out of place, except on the WWI & early fliers.

God invented quarter-scale so you could run the antenna internally.