A Look At My TV Antennas

In San Francisco - 315 feet above sea level


There are three masts with several antennas on our roof.
The first two photos give you a view from street level.


THE ANTENNAS

Let's look at the individual antennas we're using.  The antenna at
the very top, above the rotor, is the Antennas Direct - Terrestrial
Digital XG91 UHF antenna.  Below it is the Antennacraft
Y-10-7-13 yagi for high VHF.  The rotor is a Yaesu G-450A
that has a rotation range of 450 degrees and is able to with-
stand the very blustery winds here in San Francisco.  At the
bottom of the mast is an Antennas Direct SR-15 UHF antenna.


These two chimney-mounted antennas are the Channel Master
4228 for UHF and, below it, the Ability LP345F Log Periodic
for VHF and UHF, covering all channels 2 through 51.


The third mast is at the back of the house and has another UHF Channel
Master 4228 combined with an Antennas Direct Clearstream 5 for high
VHF.  Mounted nearby is a Dish 1000.2 antenna for satellite TV reception.


STATION RECEPTION

The Antennas Direct XG91 antenna, together with the Antennacraft
Y-10-7-13 yagi, provide wide coverage for us for both UHF and
VHF.  The two are combined into one coax feed.  We receive both
the VHF and UHF stations from the Walnut Grove site, 62 miles to
the northeast, where the transmitters for the Sacramento and
Stockton stations are located.  The two VHF stations and four of the
UHF stations are received on a regular basis from Walnut Grove.

These antennas also receive the two stations, one on VHF and one on UHF,
that transmit from Mt. Diablo, located 30 miles to the east. We also receive
the four full power stations, as well as two low power stations, transmitting
from Mt. Allison and Monument Peak, 35 miles away, near Fremont in the
South Bay.  In addition, we receive the three UHF stations that are located
30, 45 and 65 miles away to the north in Marin and Sonoma Counties.

Of course, these antennas work well for receiving the 12 stations
transmitting from Sutro Tower, just 3/4 of a mile away to the west, and
the five stations transmitting from Mount San Bruno, five miles to the
south.  Due to their directivity, they don't work as well as the CM4228's
for receiving both Sutro Tower and Mount San Bruno stations at the same
time.  You have to use the rotor.  Although not designed for it, they are
also able to receive the two low power stations on low VHF, transmitting from
Mt. Tamalpais in Marin County, and from Nob Hill here in San Francisco.

Here is a close up shot of the XG91 and Y-10-7-13.

Those two antennas are able to receive a total of 36 stations within
65 miles of San Francisco.  If you total up the sub-channels
from these stations, you get more than 125 channels to watch!


WHY SO MANY ANTENNAS?

Why do we need the other antennas?  The CM4228 and Clearstream 5
combination (below) are used for the HDTV in the bedroom.  While
they don't receive the distant stations, they do receive the stations
transmitting from Sutro Tower and Mount San Bruno, as well as some
of the stations in the South Bay.  They also receive the low VHF
station, channel 3, on Nob Hill that's two miles away to the northeast.


The CM4228 mounted on the chimney is used to receive the stations from
Sutro Tower and Mt. San Bruno, plus the six stations from the South Bay.
While it's a UHF antenna, it receives both VHF channels 7 and 11.  We
have it connected to the over the air receiver of our Dish Hopper DVR
and it's used for recording programs from the over the air channels.  With
it's great reception and with it locked in one direction we don't have
to worry about pointing the antenna and we don't miss any recordings.

The LP345, the all channel log periodic antenna, shown below the CM4228,
is pointed northeast at 50 degrees for receiving the VHF and UHF
stations in Sacramento and Stockton.  It doesn't work nearly
as well as the XG-91 and the VHF yagi, of course, but I mainly use
it for checking receiving conditions on these more distant stations.


This is the small Antennas Direct SR-15 UHF antenna, shown below
the rotor in the second and third photos at the top of this page.

It is pointed in the direction of 345 degrees for receiving the stations in
Marin and Sonoma Counties.  It also receives the stations from Sutro
Tower, Mt. San Bruno and the South Bay quite well off the side and
back of the antenna.  That was a pleasant surprise!


DISTRIBUTION OF SIGNALS

Each of these antennas or VHF/UHF antenna combinations are connected
to a distribution amplifier, then the signals are fed to switches, allowing
any one of the antennas to be selected with the simple push of a button
at our three TVs and the HD HomeRun and converter box receivers.


Here are two more shots of the XG91 and Y-10-7-13.


Finally, here are two additional views of the Ability LP345F Log Periodic
antenna, photographed here when it was on a different mast.


Please check out My TV Log, for a list of stations received with these antennas.  Reception for
each individual antenna can be seen by viewing the scans from my HD Home Run receivers.


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