Hi all, It's not often I get excited about an antenna manufacturer. Most designs always leave something to be desired either mechanically or performance wise. Many times antenna manufacturers compromise structural integrity for ease of assembly; or they use materials that are not compatible which lead to undue corrosive issues. Many times the performance is grossly exaggerated. Sometimes the voodoo magic claimed borders on the level of type of rhetoric you find in high-end home audio marketing. I have found one exception ... freqtester. Here we have an eBay seller. And one who has been selling the same basic design for many years now. First, he is a Ham (albeit I have yet to find out what his callsign is). He also is a machinist by trade. His products reflect this. I purchased some of his antennas many years ago, and use them all the time in some of the worst environments you can install an antenna. Namely, near the Atlantic Ocean shoreline of New York. Salt air, noreasters and hurricanes, high-winds, extremes in temperatures to name a few. These antennas deal with all of this very well. And the performance remains consistent year after year. At this point I have tried and tested all of his offerings, and used them in many different environments. First let me state, my comments on these fine antennas are subjective, anecdotal and strictly observational. I have never tested these on an analyser, measured on a FS meter or tried modeling them. So keep this in mind. Freqtester and his antenna products can be found only on eBay. I think this keeps his products at a lower cost and makes it easy for him to sell online. At this point it looks like he has sold thousands of these antennas and has a perfect 100% rating on eBay. (That does say something). Currently at this writing he offers six models of VHF/UHF horizontal loops. They are for 6m, 2m and 70cm, in both square and circular variants. They are constructed entirely of good quality 6061 aluminum. Machined parts are simple and well fashioned. All hardware is stainless steel. The 2m & 70cm loops are solid rods for the elements, the 6m is made from 7/8" tubing. The matching uses a typical gamma configuration on all. Phasing kits for stacking is also available. You can also purchase complete pairs with phasing harness included for each model. All can accommodate up to a 1.5" mast. All of the antennas are optimized for use in the SSB portion of each respective band, however tuning for other portions is easy and straight forward and the antennas have a fairly good bandwidth anyway. Power handling is between 800-1000w IACS for individual antennas; more when stacked. And I can attest to this fact since I have run as much as 2KW PEP into stacked pairs with no problems. Stacking these does seem to improve gain and improve the low-angle pattern. Gain on these antennas is claimed to be 3-5db (depending on height) for individual loops; which seems to be about right. Stacked pairs increase this slightly by a few db. Noise on receive is an important issue that should be dealt with on weak signal SSB on 50mHz and above. Horizontal loops are by their nature very low noise, even when compared to horizontally polarized Yagi's or even dipoles. So using horizontal loops for receive on weak signal work or VHF/UHF DX is a good idea. I use mine when calling CQ to listen omnidirectionally for stations coming back. Once I make contact I get a bearing and spin the Cushcraft yagi. The use of these low noise loops, especially when stacked, give me a good edge on being able to pick out stations quickly. I have used these antennas mounted on masts atop a typical suburban home, on top of a 5 story commercial building with a steel roof, and atop a 24 story apartment building in an urban environment. In all cases performance was fairly equal and consistent; with the expected additional reach on the tallest buildings. They have survived hurricanes (Sandy), numerous noreasters, and salt air exposure with minimal corrosion and no mechanical damage. Manmade noise in these environments can be very high; however, as expected these horizontal loop are very effective at rejecting these types of noise sources. These antennas seem to work best when mounted on a well grounded metal mast, even when stacked. Ease of tuning and bandwidth is improved when mounted this way. Although I have mounted these on fiberglass masts with marginal impact. running a ground wire to them in this application takes care of this minor issue and improves safety. Another nice thing is that each antenna come fully assembled and tested, even the larger 6m loops. They even include the allen key for making adjustments if any are needed. I use these with a good SHF mast mounted preamplifier (on a sequencer) which really helps pull in weak signals due to the low noise nature of these antennas to begin with. The signals come up, not the noise. This is something I highly recommend. Also they do work just fine to hit local repeaters, albeit not as well as a vertical or a vertically polarized yagi for more distant repeaters. They also are small enough to fit inside most attics (although I have not tried them in this application), great for you HOA challenged Hams. As far as the difference between the circular or square versions; I see no difference in performance between the two and you can pick them based on appearance only. If I had one criticism (and I have none other than this) it would be a lack of corrosion inhibiting. They do get that nasty coating of aluminum oxide when used in salty air conditions like I have here in New York. What I do is clean them with a good aircraft aluminum cleaner (such as Bonderite C-IC 33 Aero formerly Alumiprep 33) and use a clear stabilizing solution (such as Bonderite M-CR 1001 Aero formerly ALODINE 1001) afterward to inhibit any possible corrosion. Overall, having used all of these antennas I highly recommend them. They are high quality, easy to use, durable, come fully assembled, and perform as claimed. You can find freqtester and his antennas on eBay at this link: https://www.ebay.com/usr/freqtester?_trksid=p2047675.l2559 See Ya, 73 John, W2WDX Disclaimer: I do not know nor do I have any affiliation with this manufacturer. I just have used his products and offer this review without his input or knowledge as an enthusiastic user.