Freeview: Terrain between BS227FN and Freeview masts
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Freeview reception at BS22 7FN

Terrain between BS227FN and Freeview masts

For reliable and stable Freeview reception, you need an unobstructed path between the TV aerial on your roof and the digital TV transmitter.

The diagrams below show the transmitters you can get a signal from - in order from best to worst. The blue line tests the line-of-sight between an aerial 10 metres above ground level (the line is red if there is an obstruction in the line-of-sight). You may be able to improve reception by raising the aerial higher - for safety's sake consult a reputable aerial installer if you need rooftop access. See below the diagrams for advanced options including selecting the receiver aerial height.

The terrain information (from Ordnance Survey and GIS) does not include forestation (where leaf cover changes with the seasons) or city buildings. The line-of-sight line can appear curved as this straight line moves over the Earth's surface.

When you click on a diagram, you will see map with the location selected shown with this symbol: .Internet Explorer 9+, Firefox, Opera, Chrome, and Safari required.Internet Explorer 9+, Firefox, Opera, Chrome, and Safari required.

What do the map symbols mean?

 location on line-of-sight,  Selected location,  Freeview transmitter,  Freeview light transmitter,  Engineering/fault today....

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Saturday 23 August 2014 10:13PM

Michael Simon: There is currently (August 2014) work taking place at Caradon Hill affecting the BBC local FM service and DAB transmissions. The reserve DAB antenna is a single dipole mounted below the BBC aperture, so it is likely that the strength of the DAB signal you are currently able to receive (or not!) is somewhat weaker than normal.

Sunday 24 August 2014 10:06AM

Fran Shuttlewood: The reason for the lack of channels is most likely because that the alternative TV used for test purposes is only picking up Freeview from the local (very!) Woodford Halse transmitter, which of course would be difficult not to!

However, now that the difficulty you are experiencing has been verified on a second TV the problem can be somewhat narrowed down to either the booster being defective, or that of a defect on your aerial system. As far as the booster is concerned, although I do realise that you have had the device tested by someone from Maplins, purely for verification purposes I would like you to try the following simple test "if" you can access the booster or power supply to.

Select any programme channel you can receive, the strength / quality of the signal being noted and leaving the TV monitoring same followed by switching off the power supply to the booster, if the booster is OK then the signal will either vanish (the norm) or alternatively "might" only drop to a very low level due to breakthrough caused by the high signal level you could be receiving from the local transmitter.

If you find either to be the case?, then this points to the problem being caused by a defect in the aerial system, maybe caused water having entered the termination box on the aerial where the coax is connected into it.

Garry E Hunt
Tuesday 26 August 2014 8:52AM Bournemouth

I have pixelation and utilmately loss of picture and sound as soon as it starts raining when at BH2 5EZ using freeview. However, I do not have any problems of this type at SW20 9BA.

I should appreciate advice please

Dave Lindsay
Tuesday 26 August 2014 9:56AM

Garry E Hunt: A building or vegetation which, when wet, causes you to loose stable reception maybe. Is one or more of those tall buildings in the way?

Tuesday 26 August 2014 12:24PM

Garry E Hunt: There might be an even more simple explaination - your location in Westbourne (I know it well) may have a poor aerial system, where rain gets into it (perhaps via a degraded seal), which causes you to loose the signal. Your London location's aerial system is probably fine.

Thats not to say that there might be other factors (Digital UK reckons your a bit marginal for Rowbridge, while the terrain looks fine), but I suspect its rain getting into the system thats the most important factor.

Tuesday 26 August 2014 12:30PM

D Mitchell: You should be fine for Midhurst, which has South Today. However, if your getting BBC in HD, just not South Today, check your tuned to Midhurst. Its RF channel is 55, but Crystal Palace/Guildford are on Channel 23 and 43 - the tuner could have picked them up first.

Tuesday 26 August 2014 8:23PM

D Mitchell: BBC South is only in SD at present. The English service of BBC1 HD does not yet have opt-outs for local news.

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Please post a question, answer or commentIf you have Freeview reception problems before posting a question your must first do this Freeview reset procedure then see: Freeview reception has changed, Single frequency interference, and Freeview intermittent interference.

If you have no satellite signal, see Sky Digibox says 'No Signal' or 'Technical fault'

If you have other problems, please provide a full (not partial) postcode (or preferably enter it in box at the top right) and indicate where if aerial is on the roof, in the loft or elsewhere.

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