[drewrosenberg]

Hi everybody,


I purchased a db4 antenna a few weeks ago not realizing that there is a VHF channel in my area. I am not receiving it (ok, sometimes I receive it, but not very well).


In looking for a VHF antenna to add to my setup, I found several roof mount UHF and VHF combo directional antennas with built in rotors, rotor controllers, 30 ft of coax, etc for less than $50. The price and the fact that no manufacturer or model number is available scares me a little though.


For more detail about my location, I am attaching my TVFool report. The channel in question is 11.1 (physical channel 9). It is the same content of 4.1 (physical channel 13), but I am on the side of a hill and have no line of site to the physical channel 13 location. Also, that makes it so that all TV transmissions that I want come from roughly the same area, which makes a directional antenna attractive.


A link to an example antenna is below, but I am not allowed to post URLs until I post 3 times, so here is the text:
http://cgi.ebay.com/NEW-OUTDOOR-AMPLIFIED-VHF-UHF-HDTV-HD-ROTOR-TV-ANTENNA_W0QQitemZ270328486603QQcmdZViewItemQQptZLH_DefaultDo main_0?hash=item270328486603&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A15|39%3A1|240%3A1318"] http://cgi.ebay.com/NEW-OUTDOOR-AMPLIFIED-VHF-UHF-HDTV-HD-ROTOR-TV-ANTENNA_W0QQitemZ270328486603QQcmdZViewItemQQptZLH_DefaultDo main_0?hash=item270328486603&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A15|39%3A1|240%3A1318

 

[BeachComber]



Quote:
Originally Posted by drewrosenberg /forum/post/15529850


Hi everybody,


I purchased a db4 antenna a few weeks ago not realizing that there is a VHF channel in my area. I am not receiving it (ok, sometimes I receive it, but not very well).


In looking for a VHF antenna to add to my setup, I found several roof mount UHF and VHF combo directional antennas with built in rotors, rotor controllers, 30 ft of coax, etc for less than $50. The price and the fact that no manufacturer or model number is available scares me a little though.


For more detail about my location, I am attaching my TVFool report. The channel in question is 11.1 (physical channel 9). It is the same content of 4.1 (physical channel 13), but I am on the side of a hill and have no line of site to the physical channel 13 location. Also, that makes it so that all TV transmissions that I want come from roughly the same area, which makes a directional antenna attractive.


A link to an example antenna is below, but I am not allowed to post URLs until I post 3 times, so here is the text:
http://cgi.ebay.com/NEW-OUTDOOR-AMPLIFIED-VHF-UHF-HDTV-HD-ROTOR-TV-ANTENNA_W0QQitemZ270328486603QQcmdZViewItemQQptZLH_DefaultDo main_0?hash=item270328486603&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A15|39%3A1|240%3A1318"] http://cgi.ebay.com/NEW-OUTDOOR-AMPLIFIED-VHF-UHF-HDTV-HD-ROTOR-TV-ANTENNA_W0QQitemZ270328486603QQcmdZViewItemQQptZLH_DefaultDo main_0?hash=item270328486603&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A15|39%3A1|240%3A1318

The wavelength of Channel 11 at 199.25 Mhz is 4.93 feet. The length of the Antenna according to the specs on fleabay is 12.5 inches. I would say if you cannot pick it up with the db4 in the same direction, you will not be able to pick it up with the off brand TV antenna.


Its hard to mess with physics and laws of nature.

 

[drewrosenberg]

The physical channel is actually 9, but I guess that would be an even larger wavelength. Any idea of what the gain of the DB4 is at this frequency?