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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: . G15HE Freeview, Freeview Light transmitter Fault location on LOS
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Show good and blocked paths for aerial height of ...
Your comments: most recent posts are at the bottom
A pigeon appears to have landed on my aerial which is causing the picture on my TV constant disruption. Anyone know the policy on the shooting of poultry?
Laura Sharpes: Unless you are managing to pick up 4G signal from South-east London or Brighton (which is impossible) then you do not have 4G interference. Though I'm curious as to how you would be able to tell what 4G interference looks like!
Looking at Streetview and satellite images there are quite a few trees in your area that may perhaps rule out, or otherwise make difficult, reception from one or both transmitters.
Sutton Coldfield carries West Midlands programming and Waltham carries East Midlands programming.
You don't have clear line-of-sight to either transmitter.
The Derby transmitter, situated in Littleover at the Fire Service HQ, relays Waltham's PSB channels. It is on practically the same bearing as Sutton Coldfield and may be available to you. Its purpose is to provide East Midlands programming to those who otherwise receive from Sutton Coldfield. It does not carry the COM channels so you would have to rely on Sutton Coldfield for them.
The aerial is on my chimney, approximately 13 metres above ground. It receives Freeview Light from Rhondda at Llwynypia. For the last 16+ years it has entered a powered booster/splitter box in the loft. A loft-installed hi-fi aerial also enters the box, from which three coax cables serves three tvs and separate cables to three hi-fis. This system has worked without problem at all times and since Digital changeover, until recently. All BBC channels suffer from pixelation intermittently. On my Samsung tv the maximum signal strength is shown as 50 with small bit error readings, and it just about copes but when the problems arise the SS reduces to mid 30s or less and the Bit error shows major fluctuations and sometimes no signal. The other tvs are Panasonic and they cope better but still pixelate on occasions. The other channels show 70 with no BE activity, and very good pictures. My immediate neighbours with the same line of sight to the transmitter but from an aerial at half the height have no problems. It seems to me that the potential problems point to the aerial and or splitter/booster box. I am 75 and can no longer access my loft to check. I am sorry to bother you but would appreciate any views and advice. Thank you.
If this is the issue then it may be that it is just managing to cope with it at 50%. At times it goes higher.
Think of turning the sound up on a piece of audio equipment where eventually the sound will distort and you loose quality. That's effectively what is happening if your TV signal is too high.
Thank you Dave for your very swift response, which I have only just read. Having looked at the link, how can I check if the problem is as you suggest, and, if so, will I need attenuators on each set, or cables in the loft , or one on the feed into the booster/splitter box. On reflection, I cannot remember whether the loft box is a booster/splitter or merely a splitter. If it is the first would it be better with a splitter only? Thank you for your patience with a 'silver surfer'.
janet ludlow Saturday 25 May 2013 11:24AM Worthing
Help, lots of Channels including Yesterday have vanished from the screen , BBC ok! No problem untill about 2 weeks ago.Aerial goes to one on roof...is there work being done in this area ...Worthign!
Rowridge - the main transmitter which is on the Isle of Wight and is a bit anti-clockwise of west. If your aerial is horizontal then switch it to vertical polarisation for better reception of the COM channels.
Graham Cole: I would try bypassing the amplifier by connecting the incoming aerial feed to one of the sets. If the power supply is not where the amplifier is then you will need to remove the power supply before bypassing the amplifier. For example, the power supply could be behind one of your TV sets, it sending its power up the aerial lead into the amplifier, if it works that way.
If your amplifier acts on the hifi signal (FM radio?) then this may have a bearing on the solution.
If the amplifier has a variable gain control then that may want turning down. Failing that installing an attenuator before it will reduce the signal before it is amplified again.
As you are so close to the transmitter (it being relatively high powered for a relay at 1kW) you may get away with an unpowered splitter. I would use one with threaded f-connectors, such as this one here:
That said, I am concerned that you are unable to access your loft and of course urge you not to do more than you feel able to. It is a Bank Holiday weekend and all and it is well known that most DIY accidents happen on Bank Holidays!
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G15HE 
Freeview, 
Freeview Light transmitter 
Fault 
location on LOS 
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