During wet weather, when covered in moisture, all trees can have an appreciable effect on signals. Contact the Freeview Advice Line on 0808 100 0288, or for further details please see, This usually happens in warm fine weather, where atmospheric conditions cause television signals to travel much greater distances than they normally would. For more information see our guide on. This can increasingly happen if your batteries are beginning to fail. The first thing to do is to swap any interconnecting leads. It is important to check your installation is working properly and that your radio is in the best possible position. If you can receive a service from more than one transmitter, then you get the benefit that your radio combines the signals from all the transmitters it can receive. It helps you investigate whether a problem receiving domestic TV and radio services is due to interference from an external source, or is actually a reception problem. Depending on the device that is at fault, it may be a process of elimination to find the source. Look out for lamps which are dull or flickering as this is normally a sign they are faulty. Normally, the signals from each transmitter can only be received by those homes that have aerials with a direct line-of-sight to the transmitter. As DAB Italia works with private radio service providers, they are limited to a certain annual budget. If you have a relatively new car, the radio may have been tuned to DAB stations in a different location. To rule this out see our guide on, A manual retune is more effective than an auto-retune as it only tunes your television to the transmitter your aerial is pointing towards. Further information on tuning your DAB radio can be found by visiting the Get Digital site or see our DAB tuning guide. For more information see our interference caused by lighting. 5 Live sports extra is a secondary service of Radio 5 Live, and not always available on air. Instead, they assume that something is wrong with the device itself. When Radio 5 Live Sports Extra is on air, you should find it right next to 5 Live on the list of stations on your digital radio. Unlike the other services, all the predictions of DAB coverage are for indoor coverage. It is often a process of elimination to find the cause. Please see our help page to see how DAB multiplexes work, Therefore, you may not be receiving this service, as there is not a commercial DAB service in your local area. The RTIS is a diagnostic and advisory service provided by the BBC for the benefit of all UK audience members and broadcasters. Typical causes of interference to a communal aerial are faulty heating thermostats or a poorly suppressed lift motor. If you are in variable coverage you may experience occasional hissing or fading. Check whether any of these is being used when you experience the problem. When travelling in the car, your signal can be affected by natural features of the land, for example, hills, valleys, rivers, etc. A faulty motor can cause electrical interference. For help with other services,such as Satellite, use the Problem Assistant or try our Help Guides. We would suggest talking with a qualified mechanic if you experience interference from any item within your car. I am in the south east of the city and had problems with Radio 4 and Radio Scotland on Friday night. For reception type symptoms use the step by step guide to help troubleshoot problems with DAB radio or use the Problem Assistant. Being able to receive more than one signal using the same frequency can cause problems such as pixelation. This is a high-pitched whine that will rise and fall in a regular pattern. This can cause whining on the radio, which rises and falls with engine speed. If you are still having problems, it is possible an unwanted signal is the cause. Check our works and warning page to see if there any current weather problems. Distortion - fuzzy, gritty, scratchy sound. Since we cannot control the weather, we have no influence over abnormal propagation through the troposphere, and it is only practicable to plan a network where interference is suffered no more than 1% of the time. As a rule of thumb, hissing, distorted 'S' or 'Z' sounds, whistling and twittering are not interference but are caused by general reception problems. There are a number of things you can do to check for interference: The most common source of interference to DAB is from LED lights. These fit between the aerial socket in the wall and your television. A qualified aerial installer with local knowledge will be able to advise further. An aerial contractor should be able to recommend the best one for your problem. » Show Answer Please be aware most local news is not currently broadcast in HD at this time so will not be available on HD channels. 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