[PPRAANet] Silly Antenna question

[Bob K0NR - email list]

I agree with Brian's assessment.
I've seen people be successful with "low mounted" HF Yagi's.

Remember: all antennas are a compromise (in terms of cost, size, installation 
challenge, gain, bandwidth, ...)

Bob K0NR

On 9/30/2013 1:24 PM, Brian Mileshosky wrote:
> 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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