HDTV Forum

This antenna is recommended nationally for those 15-20 miles from the transmitter.

It can pick up VHF 7-13 and many have reported success with those channels. If you still have VHF problems you can also put up a separate VHF antenna and combine them using a UHF/VHF signal combiner.

It is a high gain highly directional antenna at about 3 foot by 3 foot and easily installs and rotates in attics if you cannot put it 10 feet above the roof line as allowed by the FCC.

Being directional a rotor may be required.

[img]http://www.channelmaster.com/images/4228.jpg[/img]

More information at HDTV Primer

http://www.hdtvprimer.com/ANTENNAS/comparing.html

and for the lobe pattern

http://www.hdtvprimer.com/ANTENNAS/cm4228.html

i pick up 2 digital channels that are located at least 100 miles away with this antenna. and i get a lot of others that are about 50 miles away. this is a darn good antenna.

Finally, I noticed that NBC (11.1) was no longer getting high
signals.. perhaps due to it being VHF and the CM 4228 is mostly an
UHF Antenna. I read somewhere that if you have the two screens of
the antenna touching, it works great picking up VHF. So, I used
more of the nylon ties to have the two screens touching each other
at 4 points. This boosted NBC(11.1) signal from 55 to 75.

how big of a challange would it be to build a 16 bay channel master.I have a cm-4228 and two cm-4221s. also where could I find out how much more gain it would get?

you might want to view or participate in this conversation...

tuning a corner reflector to a specific frequency
viewtopic.php?t=14686

I need to change the old one because i found out that it can pick up VHF 7-13.

jamesbryant0141

Either list your "ZIP CODE" so's we might understand what OTA Broadcasting is available to you or go to:

www.antennaweb.org ... following it's Instructions.

Many will need a "combo" Unit, such as Channel Master's #3016 / it's 'twin" in different packaging #5646 - - - mounted high atop your Ridge of the roof on an appropriate Mast Installation ... and, use un-spliced Quad RG-6 coax w. proper compression Terminals - not "crimped" - as well, for better results. {Earth ground it properly, too, of course!}

Not costly at all - - - available @ a variety of Web Stores for FAR less $$ than any locally.

eli

Antennas Direct DB8 UHF HDTV is a cheaper alternative with more gain. Same layout.

As the 8 bay bow tie antenna being discussed is already an array of "stacked antennas" adding another of the same "make and model" is relatively simple (if you have the room.)
The construction of the antennas is such that the two antennas can have their back screens/reflectors right up to the ends of each other. A little additional distance might give a little more gain, but it's unlikely it'd ever be noticed.

With the two 8 bay antennas mounted either one above the other or side by side, run equal lengths of coax from the antenna to a two port combiner. That's it.
If very far from the receiver then the output of the combiner would be the place to mount a remote preamp.