I recently replaced the old, semi-dilapidated VHF-only antenna on my roof with a new VU-75XR from Radio Shack. Only the antenna itself was replaced -- all wiring, mounts, etc, were reused. I'm about 5 miles from the broadcast antennas. Although the VHF performance of the antenna is great, the UHF performance -- which is what I'm really interested in -- is poor. I've compared the performance of this antenna to that obtained from the well-known Radio Shack Double Bowtie antenna placed on top of my Mitsubishi TV. Up through channel 29 or so, the rooftop antenna appears to outperform the bowtie. It's a draw on channel 32. Channels 35 and above, the bowtie dramatically outperforms the rooftop antenna. The antenna is on a rotor and I've tried reaiming it many times, without much improvement. I'm wondering if this disappointing performance might be due to the odd manner in which a previous owner wired the antenna: Standard 300->75 ohm transformer at the antenna, with coax leading down to the entry point on the side of the house. At that point, the coax enters a weatherproof plastic box and is connected to a 75->300 ohm transformer. To this transformer is connected old-style 300-ohm twinlead which is brought into the house; there's probably about 20 or 30 feet of the twinlead that terminates in the utility room. The twinlead is then connected to another 300->75 ohm transformer, which is then connected to a common 2-way 75-ohm splitter. I've connected one of the outputs from that splitter into a satellite diplexer, along with the output from my DirecTV dish. There is, of course, another diplexer at the other end of that line, and the VHF/UHF output from there is what I have connected to my HDTV tuner. Would replacing the twinlead with RG-6 coax be likely to solve some of these problems? If so, what would need to be done to ground the antenna? Whoever installed the existing wiring grounded the twinlead to a water pipe inside the house, and that would obviously need to be replaced if I no longer use the twinlead. Could I install a diplexer on the roof and then connect the antenna directly into one of the outputs from the dish's multiswitch? That would be much easier for me, as I doubt whether I'd be able to handle the installation of a new lead-in coax run -- and I'm unsure whether any installers would be interested in such a minor job. Thanks for any suggestions!