The Channel Master EXTREMEtenna CM-4228HD is built to grab both VHF and UHF signals, so it’s pretty versatile for picking up a range of local stations. From what we've gathered, it's a dual-band antenna, which should cover most of your typical broadcast needs.

The manufacturer mentions it covers VHF channels 7-13 and UHF channels 14-69, so it’s designed to work well with both. Our research suggests it's pretty solid at capturing multiple channels efficiently, especially UHF.

That said, while it can deal with VHF signals, it really stands out with UHF. Some folks have mentioned you might have to fiddle with the positioning or possibly add a preamp to improve VHF reception. This especially applies if you're in an area where VHF is more common or those signals are weak.

But with a bit of tweaking, most people found it does a great job across both bands.

Now, about using it in an attic: Although it's mainly marketed as an outdoor antenna, many have had good results using it indoors or in the attic. According to our research, it can still pull in a decent signal from up there, provided that the structure and materials of your house don't heavily block signals.

Positioning is really important—getting it high up and aiming right at the broadcast towers can make a big difference. If you set it up in the attic, you might want to experiment with different spots to get the best reception.

And adding a preamp could be helpful if you run into signal problems.

All in all, this antenna seems like a solid option, especially if you're more focused on snagging UHF channels but still want decent VHF coverage too.

Installing the Channel Master EXTREMEtenna CM-4228HD isn't too much of a hassle, based on what we've found. It's designed to be simple to set up, whether you're putting it on your roof or tucking it away in the attic. The package comes with straightforward instructions and all the bits you'll need, which definitely helps.

Now, about performance—it can pick up signals from quite a distance, up to 80 miles, and it supports uncompressed 1080i HDTV broadcasts. The 180-degree multi-directional reception is great for areas with signals coming from different directions.

But there's a bit of a catch. While getting it physically installed is pretty easy, how well it works can depend on where you are. From our research, it looks like some folks have no trouble when all the signals are coming from nearby, but others run into issues if there are hills or buildings in the way.

One tip that kept coming up is to consider using a preamplifier. This seems to boost signal strength, especially if you're trying to pick up broadcasts from various areas. Some people saw a big improvement with a preamp.

Even some professional reviews echo what we've seen—while the setup is user-friendly, you might need to fiddle with it a bit to get the best reception. If you're in a spot with obstacles or diverse signal sources, adjusting the direction or adding signal boosters might be helpful.

So, if you're looking to improve your over-the-air signal, the Channel Master CM-4228HD is a solid pick. Just keep in mind that depending on your location, you might need a few extras to get the best out of it.

The Channel Master EXTREMEtenna CM-4228HD is known to perform pretty well, especially in attic installations. According to our research, it usually picks up between 30 to 50 channels if you're within about 20 to 60 miles of local broadcast towers.

But, just a heads-up, setting it up indoors, like in an attic, can be a bit tricky. Things like walls, roofing materials, and other obstructions can mess with the signal a bit.

We've found that the antenna works best when you take the time to position it just right and aim it properly. Some folks mentioned that even if the original spot they chose for the antenna wasn't perfect because of rules about where they can put it, they got much better results with a bit of repositioning and maybe adding something like a signal amplifier.

Signal amplifiers can be really useful, especially if you're planning to send the signal to several TVs or if you need a long cable run. They help boost the signal so it stays strong.

So, while this antenna can work well indoors, how well it actually performs really depends on your particular setup and surroundings.

Overall, the Channel Master EXTREMEtenna CM-4228HD can be a good option for attic setups. Just keep in mind that things like the materials used in your house, the landscape around you, and how far you are from the broadcast towers will affect its performance.

If you're going for an attic install, be ready to spend a little time adjusting the position and maybe getting extra gear to get the best signal you can.