John Shutt wrote: >>The antenna pointing problem has to be solved even for >>recording devices. Meaning, not solved with rotors, IMO. >>In principle, that also applies to the analog time >>service from PBS. It seems fairly robust, but I'm sure >>it too has its limits. > > > The ideal situation is to be able to use omnidirectional antenna. Unless > you are in a very rare situation where you are way out in the boonies > between two major markets and can only receive signals with a huge mast > mounted antenna, an omni antenna with preamp if necessary should suffice. JOHN: let's be blunt: TALK ABOUT WHAT YOU KNOW ABOUT. I'm not in the boonies. I'm in the city. We have major stations in two directions, and soon to be three (now w and ene, soon to be s too). Despite being in a rather flat area, we do have some topography, and there are many places in town, including where I live, where you can get any Fox station with any existing omni antenna. Even in the best places it's iffy. PERIOD. In the good places it's perfectly easy to get all stations with a good BI-directional quad bowtie, such as any commercial one with the reflector cut off ... but there are NO commercial antennas which will get all networks reliably in an attic or on a very low roof, unmodified. What people are using is two antennas with two downleads. The problem, on a roof or attic, is NOT MULTIPATH, it is signal strength of the Fox channels. I know what I speak about, since I have now gone around with a spectrum analyzer measuring things. Using the two antennas solution the "wrong antenna" indeed has terrible multipath, but even then the newer STBs usually work just fine IF THERE IS PLENTY OF SIGNAL. But usually, except for one station, when there is bad multipath, the absolute signal strength is TOO LOW. Now I suspect that a PROPER omni antenna, mounted well off the roof, would work fine ... but even the nearest Fox would be a problem in many places unless it were an 8-bay antenna. AND NOBODY SELLS EVEN FOUR BAY ALL-UHF BAND OMNI ANTENNAS. I've tried designing such things and failed. It's not easy to get them all phased so that it remains omni over the whole band. We have UHF channels from 18 to 48, soon also a 50, and they will remain after analog turnoff. There is also a VHF Ch. 9, but it's close and easy to get. Now if the closest Fox were on a 1000 foot tower instead of about 480 feet, things would be mighty different. But it's not. There are other Fox's available, but they are equally weak, at best. And we are NOT "between markets" ... we are fairly close to the center of ours. Doug McDonald ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.