One of my H’s has that dipole antenna “upgrade” modification. With the exception of drilling holes in the lower shell it’s almost a plug and play installation. However, after a couple years of using it I can’t say it works any better than the original exposed antenna wire set up. As I also have one of the original release (May, 2016) Color Box versions, comparisons are easy to make.
When the H was released they had two versions; the Color Box Standard version and the H Pro. The standard had the two exposed wire 2.4 antennas while they put those B.S. “antenna holder” tubes on the “Pro” to make it look fancier. The tubes do nothing and are nothing more than empty, hollow tubes to hide the wire antennas. Other features that differentiated the Pro from the Standard was RealSense and an extra external antenna on the Pro transmitter.
If you were to remove the tubes you would find the wires hanging out the bottom of the shell just like a standard H. If for some reason you broke one or both of those tubes there’s no reason to replace them. They do nothing. If the antenna wires are intact the system will work just fine without the tubes. Perhaps better as the antennas would be less shielded.
If you want to make an improvement to the 2.4 wire antennas on an H the easiest way is to remove the bottom shell and drill a 1/16” diameter hole in the bottom shell about 9mm ahead of the landing gear opening on the tight radius bend of the shell. When you put it back together route the antenna wire through the 1/16” hole. Do this only for the antenna that exits the shell from the landing gear opening.
You also have the option of enlarging the exit opening for the other antenna by using a thin file at the air vent on the other side. Lengthen the vent slot about 1/8” “away” (outwards) from fuselage center.
Doing those mods moves the 2.4 antennas to locations that are less obscured by the landing gear and fuselage.