Topband: Flag antenna Gain:

n4is at bellsouth.net n4is at bellsouth.net
Thu Feb 26 08:48:18 PST 2009


 Bruce


> I guess My expectations for this antenna are bigger than my actual experience 
> with it. Modeling shows a 30 degree take of angle, and about -37 DB Gain. But 
> I don't think I am hearing all that well with it. 

The flag has low gain for however EZENEC does not calculate gain correctely for small loops close to ground. Check the help notes about it. One preamp is enough to bring sensivity above the loop termal noise.  I'm using one preamp with a dual flag where the gain is even reduced by the phasing lines and it is plenty of gain,

> Coax Cable is also routed out from the feed point Hozizantal for 20 feet before 
> dropping vertical, and it is not buried. Cable Length is 200 Feet. 


The choke is a must, the vertical part of the feed should not act like a vertical or a BOG. The feed line needs to be grounded, and ground loops also need to be avoid.

Regards
Carlos
N4IS


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