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> Freeview >Installing >Installing

Freeview reception - all about aerials

Your ability to receive all the Freeview transmissions depends on the suitability of aerial: the design style, "group" and its physical location.

Your ability to receive all the Freeview transmissions depends
Published on by on UK Free TV
Updated 8th January 2014.

Your ability of receive all the Freeview transmissions depends on the suitability of aerial

  • the design style,
  • the "group", and
  • its physical location.

Standard type - Yagi aerial



The standard type of TV aerial is known as the Yagi aerial. It is mounted on a pole, and consists of a rod with a reflector (shown green) at the back and many spiky elements (in grey) at the front. The connecting cable connects to the element nearest the reflector, known as the driver (shown in blue).

These Yagi aerials are directional and so pick up signals best from a transmitter that the rod points towards. The more elements the aerial has, the better it picks up a signal and becomes more directional.

A standard-type aerial is all that is required for digital TV reception in most places. These antennae have between 10 and 18 elements and a single reflector. These are recommended for new installations for good digital television reception, but will more often than not function perfectly in good reception areas.

Typically these aerials are designed to receive only some transmission frequencies - see "groups" below.

High Gain aerials



These aerials are designed for poor digital reception areas, and have two reflectors. For maximum signal strength, some digital high gain aerials have up to 100 elements. Since the switchover to digital-only transmissions back in October 2012, most UK households now have good quality digital TV signals.

A more expensive aerial is only required where the signal strength is low, but can often provide the whole Freeview reception where it might otherwise be impossible.

The CAI (that represents aerial installers) has four standards for digital TV aerials. The highest standard "1" is for homes on the fringes of coverage areas, intermediate standard "2" is suitable for use within the coverage area; minimum standard "3" is for good coverage conditions.

These aerials can be either wideband, or receive only selected frequencies - see "groups" below.

Grid



You may haved used a 'Grid aerial' for analogue reception, but as they are generally unsuitable for Freeview reception, they have now generally been replaced by the Yagi type. However in some places a Grid aerial installation may work for Freeview: otherwise replace with a standard Yagi aerial.

Indoor

Indoor aerials are generally not suitable for Freeview reception. In areas of good signal strength it is often possible to receive some transmissions. Even where an aerial works, people often find that may get interruptions to their viewing (or recording).

Loft mounted

Loft mounted arrivals are not generally recommended for Freeview reception, as the roof tiles and plumbing will degrade the signal. Some compensation for this loss of signal can be made by using satellite-grade cable to connect the set top box to the aerial.

Positioning

The best position for a TV aerial is mounted outdoors, as high from the ground as possible, pointing directly at the transmitter. The signal can be blocked by hills and tall buildings. It should be positioned away from any other aerials.

Horizontal or vertical?

The transmitter will either use vertical mode which requires the elements of your aerial to be up-down, or horizontal mode which requires them to be level with the ground.

Groups

Both analogue and digital television is transmitted the same group of transmission frequencies (known as channel 21 through to 60). A coloured marking on the aerial shows the group.



To create the best possible analogue picture, TV transmissions from adjacent transmitters have been designated to several different groups of frequencies. By using an aerial that receives only the channels in the correct group, the analogue picture can be kept free from interference.

To receive Freeview transmissions from the same transmitter it has been sometimes necessary to use frequencies that are not part of the transmitter's normal group. When this has occurred, the aerial will need to be replaced with a "wideband" aerial (also known as group W) - one that covers every group.

As Ofcom is planning to move the TV frequencies again - perhaps as soon as 2018 - it may be wise to use a wideband aerial if you can to ensure you can keep viewing Freeview for many years to come.





Your comments: most recent posts are at the bottom

firstFirst comments prevEarlier comments  ◊ 

Your comments are always welcome. Please use the form below to add your thoughts or questions to this page. We will get back to you as soon as we can.

MikeP
Saturday 11 January 2014 7:24PM

Graham Heal
For anyone contributing to this website to be able to help you they would need to know your location, a postcode would be helpful, and knowledge of your equipment, what TV etc.

It is apparent that having too strong a signal can be as bad as having too weak a signal. Plus having obstruction between you and the transmitter can be problematic as well - and tree are a case in point.

The affects you are describing would normally be categorised as pixellation where the signal cannot be decoded properly due to several possibilities. Hence the need for location and equipment information. If you don't want to give your own post code, one of a nearby shop will help.


K
KMJ,Derby
Saturday 11 January 2014 10:43PM

Justin Smith: I have seen advertisements from the U.S.A. where grid aerials were offered as being "ideal for digital"


B
Brian M. Leahy
Saturday 11 January 2014 11:21PM

I am very hard of hearing like about 14% of the population of the UK yet most of the Freeview Channels I try have no subtitles.
Why is nothing being done about this?


R
Rob
Sunday 12 January 2014 1:36PM

Brian M. Leahy: Join the club Brian I am deaf since birth. most channels don't have to carry subtitles unless they are public service IE BBC and ITV. I do find the quality of the "live" subtitles are really awful have to auto correct the words myself. I think of com is looking in to this.... so i believe.


B
Brian M. Leahy
Tuesday 14 January 2014 11:13AM Abingdon

Brian M. Leahy: I understand that but when I contact channels with no subtitles many of them claim that they were using them on the programmes I complained about which suggests a technical problem.


R
Rob
Tuesday 14 January 2014 6:08PM

Rob: i know brain but its no excuse really....... its time we deaf fight for full access to tv end off.... we should not pay full licence fee at all... blind people get cheap tv licence so why not for the deaf.... lets be fair here.....


R
Rob
Tuesday 21 January 2014 9:25AM

Rob: I have noticed one thing.... if you have a cheap and cheerful STB box on normal tv... the subtitles on there are not very reailable ie bush,alba boxes they need to b e reset nearly all the time.... I think its time we can find out which STB and PVR are more realiable than others and why?


R
Rawlinson
Tuesday 11 March 2014 5:32PM

Question:
I have a roof space fitted aerial supplied in my brand new house whose elements are nailed to the rafters, where they touch?? The weird thing is it's a new Yagi, but pointing in EXACTLY the opposite direction to the transmitter. Signal quality on diagnostics seems to be nearly 10 across the range but signal strength seems 8 to 10, HD is the worst affected. I only live 4 miles from the transmitter, but the elevation is quite low. Is the reversed direction an attempt to reduce the signal strength? Or should I un-nail it and point it towad the mast, for 10 out of 10? as I'm losing HD on occasion!


MikeP
Tuesday 11 March 2014 7:55PM

Rawlinson
You don't indicate where you live so we can't work out which transmitter you would be using. It doesn't much matter about elements touching woodwork as long as they are not distorted. Pointing the opposite way may be a problem though, I assume you are viewing the aerial as having the longest part of the boom in front of the folded dipole aiming away from the transmitter. You should not be trying to get a signal strength of maximum for all channels, too strong a signal causes the exact problem you are describing and affects HD services most..


S
Steve P
Thursday 13 March 2014 12:25AM Wrexham

Rawlinson

DRY wood is a good insulator so not big deal - if a little unprofessional.

At 4 miles you may well be right about reason.

Does it work?

If so don't fix it.

If it is a powerful Tx 4 miles away you may not need an aerial at all. In London I do fine with just a fly lead connected to nothing.


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