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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: . SK64NN Freeview, Freeview Light transmitter Fault location on LOS
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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.
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SK64NN 
Freeview, 
Freeview Light transmitter 
Fault 
location on LOS 
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