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Scanner / Receiver Antennas - For discussion of any type of receiving antenna used by a scanner or receiver base, mobile or handheld.

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Old 10-11-2017, 9:26 PM
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Default High gain 800 MHZ

Why am I not finding any high gain 800 mhz mobile antennas? When comparing vhf to uhf the uhf ones alway have higher gain. The higher the freq the more common the gain but I'm not seeing that in 800 mhz.
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Old 10-11-2017, 11:38 PM
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http://www.theantennafarm.com/catalo...-dbc-wifi-237/
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Old 10-11-2017, 11:43 PM
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3dB are pretty common. Look for the co-linear design, the ones with the coil (either open or closed) about 1/3 of the way up.
5dB are available, also.
Larsen, Laird, MaxRad, Comtelco, etc.
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Old 10-12-2017, 5:15 PM
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Default Exactly

Here is my current antenna with gains of 8 and 12 db as you go up. I thought I could find gains about 15 or more in the 800 range. http://www.cometantenna.com/wp-conte.../09/gp-9nc.pdf
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Old 10-12-2017, 5:26 PM
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Wait, I thought you were looking for mobile antennas?

If it's base, I've got 9dB base antennas at work. Not cheap, not for most hobbyists, but they are certainly available. Much above that, and you start getting into sector antennas, etc.
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Old 10-12-2017, 10:07 PM
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Yes I am looking for mobile. My point was just that I thought there would be more gain on 800 mhz mobiles like there are on bases.
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Old 10-12-2017, 11:24 PM
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Since bases are much taller, it's easier to make them higher gain. With the limitations of mobile use, not so much.

Also, since most 800MHz use involves repeaters, high gain antennas are not always necessary.

3dB mobiles are common. 5dB are more rare. I don't recall seeing any mobile antennas with more than 5dB, not that they are not out there.
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Old 10-13-2017, 2:30 AM
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I have been using a Laird Technologies TRAB7603 760-870 MHz. 2.7" ABS plastic Phantom Antenna rated at 3dB for years and I couldn't ask for anything better. Many of the cruisers I see have them as well.

http://www.theantennafarm.com/catalo...7603-3241.html
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Old 10-13-2017, 4:34 AM
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This is what I use. DPD Productions - Base & Mobile Antennas for Radio Scanners: VHF, UHF, NOAA, Low-Band, 700 MHz, Police, Fire, Public Safety
It is a 5 dbd antenna, a 5/8 wave double design., For serious long distance 800 mhz, I have a 6 element yagi, barely 12 inches long. Go to Amazon, search out 800 mhz yagi antennas. Lots of designs, from $20 to to $100.00
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Old 10-13-2017, 10:11 AM
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Quote:
Originally Posted by scanmanmi View Post
Yes I am looking for mobile. My point was just that I thought there would be more gain on 800 mhz mobiles like there are on bases.
the highest gain 800MHz mobile antenna I can think of off the top of my head is a 5/8 over 5/8 over 1/4wave. common back in the day for cellular phones. they can be found in both elevated feed(No ground plane needed) or with out the elevated feed:

http://www.theantennafarm.com/catalo...8455-3297.html

They also come in 5/8 over 1/4 wave as well:

http://www.theantennafarm.com/catalo...8005-5923.html

In a mobile environment, you should not require more than 5dB gain. There is less than a S-Unit difference between a 1/4 wave antenna and the three section high gain antenna.

Physics and terrain will limit what you can or can not hear more than a low or high gain mobile antenna at 800MHz
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