whats the best antenna except a discone for uhf receiving

[david1975au]

dear aust forum hi im from newcastle ,ive tried every discone there is in australia radioshack, diamond discone active antennas ,icom ah7000 discone benelec , anyway every scanner ive tried with no vertical on top or without any top vertical the uhf receive is poor locals even fade out.the only 1 ive tried is 4db antenna etc and 6 db works great on uhf freqs why in the specifications do they put they work on uhf good but they dont.when i try a 4 or 6db base antenna its excellent on vhf and uhf .alsos a discone is excellent on vhf hi and vhf lo but no good on uhf im wondering why, regards david nsw australia . 8)

 

[N_Jay]

Re: whats the best antenna except a discone for uhf receivin

dear aust forum hi im from newcastle ,ive tried every discone there is in australia radioshack, diamond discone active antennas ,icom ah7000 discone benelec , anyway every scanner ive tried with no vertical on top or without any top vertical the uhf receive is poor locals even fade out.the only 1 ive tried is 4db antenna etc and 6 db works great on uhf freqs why in the specifications do they put they work on uhf good but they dont.when i try a 4 or 6db base antenna its excellent on vhf and uhf .alsos a discone is excellent on vhf hi and vhf lo but no good on uhf im wondering why, regards david nsw australia . 8)

Whjat length of cable?
What type of cable?
How far away are the UHF systems?

 

[david1975au]

reply to discone theory

dear sir, ive tried rg213 not rg58 ive tried belden 9913 and some of the stuff is from maybe down the central coast etc thanks david nsw australia ,

 

[mancow]

It's because it's too large. I bet that if you had a smaller discone scaled to the upper frequencies it would work much better in that range.

You mentioned getting better reception with a gain antenna. That's exactly correct. A gain antenna exhibits gain whereas a discone has no gain. Generally gain antennas cut for specific bands will almost always outperform a wideband antenna.


mancow

 

[david1975au]

uhf antennas over discones

dear sir, your exactly right ill have to get myself a 6 9 or 12 db antenna stick rg213 or beldon 9913 or 10 dfb etc and i have a uniden250d with the apcoi25 card scanner here . imwaiting on a pro96 i paid $300us plus $30airmail freight but the letter sent on the 12th hasnt got there as yet it was sent airmail ,anyway thanks for your help ive been given a 7 element rfi beam so far from a friend, regards david1975au nsw australia . 8)