Advice for dipole antenna on terrace house roof

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SW_UK_UGR
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Advice for dipole antenna on terrace house roof

Post by SW_UK_UGR » Tue Jan 08, 2019 1:19 pm

Anyone have any advice for putting a 15w low power half wave dipole antenna on the roof of a row of terrace houses?

There are neighbouring aerials along the roofs for peoples TVs etc.. so my main concern is how much interference this would cause to my neighbours (who might care but might not). I cannot lift the antenna more than a couple metres high from the roof, if that, as it will be really visible from the front of the house which is on a main road. Even though I will only be using it at night time, it may look pretty bait.

This is only a temporary solution until better locations are found for broadcasting times.

I could put it in my garden up a tree although it will probably be mostly shielded by the house (a good 20-30 metres away maybe more)

There is also a telephone wire pole out the back of the house which has no cables connected, its just the wooden pole and metal climbing pegs, but it is preettty high and I would need to invest in more cabling to reach the TX if I was to go with this idea and somehow get it to the top.

I will post some follow up pictures below in the replies when I have taken some.

This is the antenna I will be using (no amplifier) - https://www.pcs-electronics.com/power-h ... -1477.html?

Powered by the MAXPRO7015+ 15W - https://www.pcs-electronics.com/maxpro6 ... -2434.html

Thanks :tup

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Re: Advice for dipole antenna on terrace house roof

Post by tokingmenace » Tue Jan 08, 2019 1:58 pm

Not the best option to run direct tx from your house - but if it's only now and again with 15w, you will prob be fine.

The main thing is to check you are not causing any local interference tvi. If people start to have interference and notice
a new antenna in the area, they tend to start asking questions.

What about mounting your antenna to a 'pull up mast' or making something out of scrap poles. That way the antenna is only in the air
when you are on at night. Something you can easily drop down in the day.

Personally I would use an antenna with some gain, to give you more erp, preferably a resonant antenna on the freq you choose to use.

:smoke

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Re: Advice for dipole antenna on terrace house roof

Post by SW_UK_UGR » Tue Jan 08, 2019 2:25 pm

Thanks for your reply :)

Yea I only plan on doing it a few times from my house to play around with the new TX and test distance etc.. I don't particularly fancy losing my set up and beloved record collection!!

What would be the best way to check if I am causing interference other than just checking my own TV?

Yea I was only planning on having the antenna up whilst im on at night and it would be packed away again by daylight.

I will add some pics tonight when im home

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Re: Advice for dipole antenna on terrace house roof

Post by McDonalds » Tue Jan 08, 2019 4:14 pm

I can run 30 watts in my loft and freeview is OK but have to pick the right dial bottom band being best for me.
also have aerial in garden this means not as much RF its also away from the house on a pole 3 floors high.
signal only goes about 6 miles but there lots of buildings.

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Re: Advice for dipole antenna on terrace house roof

Post by Albert H » Wed Jan 09, 2019 3:46 am

A dipole isn't the right aerial for the job! You need to use something with a ground plane to prevent downward radiation into the houses. Your best bet would be a ⅝-wave vertical with ¼-wave ground plane rods. You could bolt it to a chimney on a short pole and leave it up there - if anyone asks, it's a CB aerial!

Another thing to consider is that the feeder should be as short as practical - you don't want to lose your expensively generated RF in heating up a wire! The telegraph pole idea is only OK if the rig is at the bottom or even part way up the pole!

15 Watts with the right aerial from a reasonably high site will go for miles!
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Re: Advice for dipole antenna on terrace house roof

Post by SW_UK_UGR » Thu Jan 10, 2019 11:36 pm

The aerial was originally perfect for what we were going to do with it but plans changed, will look into the ground plane idea, although i only plan to use it there a few times

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Re: Advice for dipole antenna on terrace house roof

Post by SundayGroover » Fri Jan 11, 2019 8:14 am

I used the NRG half-wave vertical when I operated from home (most weekends for a year or more!). Mounted on pole well above roof height and using my 20w TX covered a very acceptable range!

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Re: Advice for dipole antenna on terrace house roof

Post by SW_UK_UGR » Fri Jan 11, 2019 6:50 pm

ground plane antenna has been sorted :tup nice one for the advice guys :smoke

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Re: Advice for dipole antenna on terrace house roof

Post by Albert H » Fri Jan 11, 2019 11:57 pm

Good luck!

A properly matched ground plane aerial always works better than a simple dipole. You'll be pleasantly surprised by how far your little signal will travel.
"Why is my rig humming?"
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Re: Advice for dipole antenna on terrace house roof

Post by piraterx » Sun Jan 13, 2019 4:37 pm

I remember many moons ago we disguised a dipole with a For Sale sign on the house!

Drummed up a bit of interest,not from the feds but mr and mrs looking to mortgage their first house!!

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Re: Advice for dipole antenna on terrace house roof

Post by s2000 » Sun Jan 13, 2019 8:14 pm

piraterx wrote:
Sun Jan 13, 2019 4:37 pm
I remember many moons ago we disguised a dipole with a For Sale sign on the house!

Drummed up a bit of interest,not from the feds but mr and mrs looking to mortgage their first house!!
Lol, it's quite a good idea!

I have often thought it would be good to make a slimjim style antenna disguised as a Christian cross... and fit it to a high church! That would have the rig theives confused :lol:

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Re: Advice for dipole antenna on terrace house roof

Post by SW_UK_UGR » Tue Jan 15, 2019 4:14 pm

:lol: :lol: :lol:

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