[John Candle]

Both Tower Guy and ADTech abereviate words and numbers assuming that every one knows what it is. The 7777 is Channelmaster CM7777 preamp..the preamp has inputs for VHF and UHF Tv antennas. The YA1713 and Y10-7-13 are both Tv antennas that have metal receiving element lengths sized and spaced for VHF channels 7 thru 13. You have a channel 8 station. Multipul channel antennas have metal receiving elements of many different lengths and the elements are spaced so the elements react with the other elements so as to increase the reception of all the elements. These multipul channel antennas receive very well for 90 % of reception situations. In dificult reception situations a cut to channel or a antenna that has limited band width will have 3 maybe 4 dB better gain then a multipul channel antenna. And the cut to channel or limited band width antenna is better because the area is bigger with elements the same size. From a certain point of view one might say the cut to channel/limited band width antenna catches more signal with elements that are all about the same size over a large area.