When I first bought this unit, it filled in every way possible when I tried to combine it with my 8 Bay antenna. I threw it in my garage and let it collect dust and spiderwebs have recently pulled it out and replaced the I threw it in my garage and let it collect dust and spiderwebs have recently pulled it out. I replaced the balun that comes with the C5. I have locked in my low VHF channels including my problem channel KCAL 9 in Los Angeles.

Ordered a 150-mile directional antenna for $35 to see if I could get any channels OTA and found 13 with the included amp at a height of about 12' above my roof. The only problem was that the directional antenna was VERY directional and I could only get a few channels at a time without constantly searching for them. After talking to the very helpful people at Antennas Direct I ordered a Clearstream 5 for my VHF and a DB8E for my UHF. I placed it on an Antennas Direct heavy duty tripod with their 15' telescoping mast (secured by 3 guy wires) and BOOM 14 channels with mo amp and no turning. I have a Channel Master 7777 Titan pre-amp on the way because there are a few more channels that I think I can get that are just a little too weak now. BTW I live in the worst possible terrain ever created for antennas. The Mountains of western North Carolina are steep and heavily wooded.Granted I do not have any trees surrounding my home but it is located in a tree-covered bowl hollow. Fcc says I could get 1 channel! Can't wait for my pre-amp!

I was looking for a signal combiner to add a vhf antenna to my mast, this one works well and signal isn't reduced.

After ordering from this page, buying directly from Amazon rather than a 3rd party seller, I received a different brand of VHF/UHF combiner than the Antennas Direct one shown. Per its labeling, what arrived was a Stellar Labs 33-2230, which is separately listed here:
https://amazon.com/Masthead-Antenna-Combiner-Inputs-Combined/dp/B015ZSVDAW/ but marked as "Currently Unavailable" on that listing.

Despite this, I decided to keep the Stellar Labs combiner, because its performance appears to be very close to that of the well-regarded Antenna Direct model - possibly a half-dB or so of extra insertion loss, but I'm not set up to accurately measure that, and all signals come through strongly enough on both bands.

So, be aware that unless my substitution was just a random fluke, there's a chance you might order this and receive one of a different make, but which for most purposes should be functionally interchangeable.

Unlike the pictured Antennas Direct combiner, my Stellar Labs one has a switch to toggle DC pass-through to the UHF port - off by default - but came without a U-bolt to secure its external housing to a mast (though it has holes to fit one) and without any instructions or spec sheet. This did not matter to me since I planned to install it indoors anyway, with two separate coaxial cables coming in from the antennas, but could be an unwelcome surprise to someone wanting to pole-mount it. Another difference is that the metal housing of the combiner itself (not its plastic housing) seems larger, and may be press-fit together rather than soldered, with no screw-mount holes on the sides. Despite installing indoors, I decided not to try removing its plastic housing, out of concern that forcing it out could bend the thin-looking metal and compromise RF shielding. With the plastic in place, though, there is not enough clearance to place an inline filter on any of the three ports, so I moved my LTE filter to the antenna end of my UHF-in cable.

Sometimes a product exceeds your expectations, and this is one of those times. I'm fairly specialized in RF (radio) engineering and when another reviewer posted technical details (network analyzer plots) I was surprised to see such good performance - almost to the point that it was hard to believe. So I bought one and repeated the measurements, and to my surprise I could mostly replicate them.

The summary: this thing works actually very well for a $20 consumer grade product. The loss in-band is very low, and the rejection out-of-band is pretty high - exactly what you want.

Most reviews of antenna parts are qualitative in nature, from well-meaning people who slap things onto their roofs, but have no idea what they are talking about or if their experience is representative for others. So you can sell someone a piece of garbage, and 9 out of 10 people would not be able to tell. This thing does not fall under that category - hat off to the seller.

I'll attach my plots too, for the other nerds who are equally hard to convince as myself. I calibrated the VNA with 50 ohm standards, because that is what I have, so there will be some sub-dB inaccuracies - but they don't materially affect the results.