[PPRAANet] Silly Antenna question

[Brian Mileshosky]

John --

If it's not too much trouble to install it in the place you have in 
mind, even temporarily, give it a shot.  At the minimum you'll buy 
yourself the ability to test antenna A with antenna B directly and see 
for yourself how the yagi is doing.

My guess is that the yagi will do fine.  It definitely won't be 
optimal, but even in a disadvantaged configuration, i.e. a few feet 
above your roof, my guess it'll still probably outperform your G5RV in 
the direction you want to be transmitting in.  Materials near the 
antenna, especially in the near-field and transition zone between near 
and far fields, will no doubt have an effect on its impedance match and 
pattern.  You can likely tune out impedance effects with an antenna 
tuner if needed, but the pattern will be what it will be.  Be mindful 
that, with that much gain right next to the innards of your house, you 
may develop a case of RFI with things you didn't have before with the 
G5RV, but that's just part of the game we play.

Have fun learning while having fun!

73,
Brian N5ZGT


On Sep 30 2013 12:33 PM, John Hooker wrote:
> Good afternoon everyone,
>
> I have a question that I think I know the answer to but to have
> someone else tell me would make me feel better. I have recently
> acquired a Cushcraft MA-5B, my first HF yagi, I want to put it on the
> roof, the problem being my home is 31' tall and I am not allowed to 
> go
> any higher than 35' AGL with an antenna. 4 feet is just not enough
> room to be away from the shingles, to not have a very severe effect 
> on
> SWR or performance correct? Should I just put this back in the box
> until I get the money to go to the town and fight for a tower, and
> just keep using the G5RV strung in the yard.
> I am pretty sure of my answer but sometimes I just need a good kick
> to get my brain staarted.
>
> Thanks everyone
>
> John H
> KC2JEJ
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