This is a versatile antenna system that can work as both an adjustable dipole antenna and a vertical antenna using inexpensive off the shelf components.  It is highly recommended to print this in PETG with 100% infill as the stress caused by the cantilevered whips is quite high.

The story behind the N2EC VersaHex and build instructions can be found at https://n2ec.us/project/the-n2ec-versahex-antenna/ and a bill of materials for the basic design and some accessories I've used can be found here. 

To summarize the build:

Electrically, the N2EC VersaHex it is quite simple. The dipole feed-line enters at 4 on the diagram at the left BNC connector. The center conductor of BNC 4 connects to connection 1. The 16 AWG wire is soldered to the center pin of the connector and then is connected via a ring connector to connection 1 using a M10 bolt, 6 M10 washers (3 on each side of the plastic case) and a M10 coupling nut. The ground of BNC 4 is connected in a similar fashion to connection 2 but instead of soldering to the BNC, a ring terminal is used on both sides of the wire.

The vertical feed-line enters at 5 with the center pin of the BNC connector going to connection 3 (with the same bolt, washer, ring terminal, and nut arrangement of the dipole).  The ground connection of BNC 5 is connected to connection 6.  Things are pretty tight in here, so I find that pre-folding the ring connectors as seen in the diagram can help with installation.  Also, DO NOT SKIP THE WASHERS!!!  These distribute the forces from the whips on the plastic.  In testing users who didn’t use the washers had the plastic hub fail catastrophically.  Use the washers!  This may also be a good time for me to say that this is a hobby project, so if you decide to build one of these it is at your own risk.  I’m sharing this so other folks can have some fun, but I can’t provide support to everybody on the internet, and if something breaks, I can’t help you fix it.  As they say, no warranties are expressed or implied.  The Bill of Materials I used (along with some optional bits) can be found here.