Twisty Member 182 Member For: 19y 3m 19d Gender: Male Location: Melbourne Posted 02/09/08 10:30 AM Posted 02/09/08 10:30 AM Are they the same decibel rating?When it comes to the UHF aerials, the decibel rating determines their range and effectiveness.Check this out to explain the differences...Firstly let's look at Gain - If you look at the diagram below, with the vertical line representing the antenna, the outer circles indicates how the signal is transmitted with various gain antennae. In summary the higher the gain the more direct and pinpoint the signal, thus longer distance but far less 'rollover' effect, consequently reducing performance in hilly areas.The diagram below typically shows what happens to the signal between two vehicles - note how the signal with a 3db gain antenna actually reaches the second vehicle s antenna but the 6db does notIdeally if would be advantageous to change antennas when in flat country and also when in hilly country - This situation is certainly not ideal, so a compromise is the only answer - In summary the best all-round choice is 4.5-6dbHope that helps mate.
Cagey Member 36 Member For: 20y 6m 2d Posted 02/09/08 12:09 PM Posted 02/09/08 12:09 PM Thanks twisty....makes alot of sense looking at the diagramsboth of my antennas are 4.5 - 6 dbjust did a little drawing of both antennas on the carso effectivly both of these antennas would work exactly the same if they where on the car like in the pic right? if they were a different db rating then it would b a different story
Twisty Member 182 Member For: 19y 3m 19d Gender: Male Location: Melbourne Posted 03/09/08 01:20 AM Posted 03/09/08 01:20 AM Haha, great artwork!Yeah, they'll have the same effectiveness, if they've got the same DB Gain, and they're mounted the way you've skillfully drawn. haha.
Cagey Member 36 Member For: 20y 6m 2d Posted 03/09/08 08:19 AM Posted 03/09/08 08:19 AM haha thanks for the complimentsbut seriously that's for the advice and diagrams, made things alot clearer!
Cagey Member 36 Member For: 20y 6m 2d Posted 07/09/08 08:01 AM Posted 07/09/08 08:01 AM Anyone using a Uniden UH015sxIf so what do you think?
Adam Here since the start... Legacy Donating Member 10,282 Member For: 23y 4m 24d Gender: Male Location: Victoria Posted 07/09/08 08:15 AM Posted 07/09/08 08:15 AM Threads merged.
BFHOON Legacy Donating Member 1,932 Member For: 20y 5m 26d Gender: Male Location: nsw Posted 07/09/08 09:32 AM Posted 07/09/08 09:32 AM imo the best mobile antenna is a rfi evelated feed 4.5/6.5 db.they call it a 6.5 but I cant see a 4.5 gaining with just an elevated feed.
sexual harrassment panda I see a red door and I want to paint it black Legacy Donating Member 5,919 Member For: 16y 10m 25d Gender: Male Location: Far north queensland Posted 07/01/10 08:40 PM Posted 07/01/10 08:40 PM ok old thread but I'm getting a uniden uhf/scanner and was wondering if anyone could recommend a small/discreet antenna for me
adaze Member 2 Member For: 18y 3m 25d Gender: Male Location: Broken Hill, NSW Posted 22/01/10 10:43 AM Posted 22/01/10 10:43 AM (edited) Hey Sideways,I recently got a "Clear Glass Antenna" which is made by Laser Antenna and it works great!Granted it doesn't have the range of a proper external antenna, but it does the job. Edited 22/01/10 10:44 AM by adaze
sexual harrassment panda I see a red door and I want to paint it black Legacy Donating Member 5,919 Member For: 16y 10m 25d Gender: Male Location: Far north queensland Posted 23/01/10 12:09 AM Posted 23/01/10 12:09 AM thanks man looks sweet, but I got and awesome deal of fleabay on a uhf/6db antenna combo
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