Channlel Master 4228 is a good choice for UHF.
http://www.warrenelectronics.com/Antennas/joiners.htm this would work with the antenna.

wmhjr said:

ABC is channel 4.1, but it's UHF, right? But, UHF is only above channel 13, so what gives?

Click to expand...

Most likely your analog version of ABC is Channel 4, The UHF version is Ch 51 but remaps to Channel 4 on your tuner to make thing easier. My ABC is the same way, Channel 2 on analog but 20 something on UHF.

The UHF channel the signal is actually received on is the channel for which you spec JoinTennas and the like, not the virtual channels that match your existing local television station channels. Almost all digital TV channels are UHF.

I assume you've checked out your receiveable channels here, but if not, here is a link:
http://www.antennaweb.org/aw/welcome.asp

While I can't strongly endorse JoinTennas, you should order one for Channel 51. Actually, JoinTennas for UHF come in 3 Models which cover a group of channels each. When purchasing, you order the Model that covers your channel, tell them the specific channel, and the factory sets the filter for your specific channel 51. These things are not reliable and the UHF ones will bring in channels at least 2 on each side of the designated one (e.g., Channel 51 JoinTenna will bring in anything from 49 through 53). When used as a trap, they block at least 5 slots. Don't use with a pre-amp, they should precede the pre-amp if you do. I've found them to not be very rugged or durable either mechanically or electronically (I have 2 where the circuitry just stopped working).