I have so far used a Spiderbeam 5 band - HD on my little tower (at a total some 15m over the ground) - and have been very happy with the performance. However, missed 30m and 40m opportunities. I was therefore very excited after swapping it for a PRO-67-C3 and over what it could give me. The antenna came very well packed and everything was well color coded. My only challenge was that it was a wrong packing when it comes to the boom itself. It was 2x # 1 and 2x # 2 instead of 1 to 4. I managed to assemble them after a little tricking with the drill, and measured everything again - when it came to the placement of the elements. Marked this again on the boom and recalculated and measured several times just to be sure before I started the assembly. Everything else was absolutely perfect. I tried to be extra careful during the assembly of the elements, and checked and checked that everything was correct during the whole process. On the whole, there were few challenges during the entire process. I had read the installation instructions many times even before I received the antenna to be prepared. I use a lot of digital modes, so I tried to calculate the length of the 40m end pieces to fit this and used tape to keep them in place temporarily. Took the first SWR test while the tower was still in the lower position - only to see that there was nothing totally wrong, but was pleasantly surprised by the result. Then raised the tower to its full height and checked the SWR. To my good surprise, 40M was just fine to 1.2 in SWR - and the rest of the bands to 1.1 to 1.25 - EXCEPT from 12m - it was / is 2.3. 12m was far too high in the resonance. Then took down the tower and fastened the 40m end elements with screws and checked everything I could think of had something to do with 12m - without finding anything wrong ?? . Then hoisted the tower again and checked my measurements - and everything except 12m was still perfect. Then it was to try the antenna on the air, but was first surprised at how few stations I heard, but now the bands are pretty quiet during the day. Had a few laps with FT8 on all bands and followed on pskreporter. There I was surprised to see that the antenna was very little directional - then in relation to my Spiderbeam. And with the 25W output effect, I got a lot more people who could receive me than I could receive - and on pskreporter I see that those who could hear me were just as happy 90 degrees to the side as from behind. Hmm - not as I expected. Since I do not have both antennas up at the same time, it is impossible to compare, but my feeling is that my receiving possibilities did not get any better with this antenna. Took a round at night of 40m and had several FT8 contacts to South America. However, there was very little difference between the beam and my vertical, but to some extent the beam. By listening to some weak SSB stations and then turning the antenna in different directions - I find that there was almost no difference on the front or back of the antenna. On the whole, it is very little dependent on direction. Slightly better at 10m to 20m, but still. So my first tests give me a feeling that if it had not been for 40m - then I would have mounted my Spiderbeam back. Dos it work - yes it dos, but not as I had expected - and or hoped for. So disappointed - yes - in relation to my Spiderbeam But will continue my testing, and I will take down the tower again - to once again go over my measurements of positions of elements on the boom and again make a full length measurement of all elements according to the manual. All the measurement are there - and that's a good thing.