menuMENU    UK Free TV logo Freeview



Click to see updates

New and improved Freeview radiation patterns

I'm very pleased to announce that the list of the radiation patterns - the diagrams that show the power levels for each direction from a transmitter - have returned in an improved format. In addition UK Free TV now has 528 new patterns received in the last month from Ofcom under a Freedom of Information Act request.

Radiation patterns   Photograph:
Radiation patterns Photograph:
published on UK Free TV

What are radiation patterns?

All ground-based broadcast transmitter – be it for a Freeview, DAB, AM/FM radio or mobile phones – can and do broadcast their output at different levels in different directions.

The diagrams here on UK Free TV show all the known patterns.   In theory each transmitter can have a different pattern for each transmission frequency.     

This diagram shows how the Primrose Hill Freeview transmitter's coverage map and the radiation pattern for it.

Radiation pattern example

Why did you say "known patterns"?

Because, and I quote

  • disclosure of the antenna radiation patterns into the public domain could lead to these being available to foreign administrations, which would substantially weaken HM Government's negotiating position with respect to international frequency clearance;
  • a weaker negotiating position for HM Government may lead to additional cost for the broadcasters (where antenna systems have to be re-built as a result of international coordination) and lower coverage for viewers (where antenna systems have to be restricted in order to protect foreign transmissions); and
  • the BBC is required to provide coverage of its services on digital terrestrial television to a certain proportion of the population by the completion of switchover and a failure or suboptimal result from international co-ordination may harm the BBC's ability to meet this obligation.

The number of sites that we have data is limited to the data released by the BBC in 2009 – see Update on transmitter radiation patterns (BBC FOI request) – plus the new data from Ofcom.


What is the new data?

With help from Dave Lindsay, I contacted Ofcom to ask them to release the data related to the upcoming UK Digital Terrestrial Television: International Coordination Agreements

I do note that on the above-mentioned Ofcom link there is a link to "International Co-ordination Technical Parameters and Nominal Antenna Templates"  This would appear, on the surface, to provide some of the missing transmitter data.     Whilst I understand that this is co-ordination information and may represent greater coverage than the actual transmitters use, I would prefer to have some radiation pattern information with a written warning, rather than "none".  

Do the new patterns match the output?

"While you are already aware of this, I would like to emphasise that the powers and antenna templates in these files represent the upper limit of the UK’s internationally agreed rights for specific frequency assignments, and the actual antenna patterns and/or powers used by the broadcasters are often more restricted. Additionally, not all of the assignments which have been co-ordinated are currently in use." - Ofcom


New SVG format

UK Free TV was using "HTML5 canvas" to draw the radiation patterns.     However the site now uses the SVG format for the graphics.     This has the several advantages, in particular that it is now easy to embed more than one diagram in a page where necessary. 


Some examples of the new data

Where the diagrams show (CCN) this is the new "Co-ordination combined nominal template derived from International co-ordination technical agreements" data.  A pattern with a "F" prefix is for a frequency not currently used at that mast for a live TV service (F570 is 570MHz also known as UHF C33). 

New radition patterns


What next?

The site's coverage maps will be regenerated soon to include all this new data. 


Help with Television sets?
Why are all TVs on sale not digital?1
Do I still have to pay for a TV licence?2
I had perfect channel 5 reception - until I got a digital TV box!3
I Have a Pocket Tv For taking out so I can keep up with news and sport. Will thi4
The pictures from my digital box are all green!5
In this section
Why did the BBC just use 1.1 Million TV Licences to buy UKTV from Discovery? 1
ITV and Freeview2
New Freeview Mobile App Launching in January 20193
Freeview 2024?4
Broadcasters collaborate to secure future of free-to-view TV 5
BBC Local Radio on Freeview 6

Monday, 7 December 2020
10:53 PM

I am actually thankful to the holder of this site who has shared this impressive piece of writing at here.

link to this comment
attorney-co's 1 post US flag
Tuesday, 8 December 2020
7:38 AM

Excellent goods from you, man. I have take into
account your stuff prior to and you are simply extremely great.
I actually like what you have acquired right here,
certainly like what you are stating and the best way during which you say it.
You are making it enjoyable and you still take care of to stay it sensible.
I can not wait to learn much more from you. This is really a terrific web site.

link to this comment's 1 post US flag
10:44 AM

I like looking through a post that can make people
think. Also, many thanks for allowing for me to comment!

link to this comment's 1 post US flag
10:56 AM

If some one needs to be updated with hottest technologies then he must be
go to see this site and be up to date daily.

link to this comment's 1 post US flag
11:32 AM

First off I would like to say awesome blog! I had a quick question in which
I'd like to ask if you do not mind. I was curious to find out
how you center yourself and clear your head before writing.
I have had a hard time clearing my thoughts in getting
my ideas out. I truly do take pleasure in writing however it
just seems like the first 10 to 15 minutes tend to be lost just trying to figure out how to begin. Any
suggestions or tips? Thank you!

link to this comment
algorairtransport's 1 post US flag
4:16 PM

I am genuinely thankful to the holder of this website who has shared this wonderful piece of writing at at this place.

link to this comment
clinicsepid's 1 post US flag
5:00 PM

Thanks for another great article. The place else may just anyone get that type of info in such an ideal
manner of writing? I have a presentation next week,
and I'm on the search for such information.

link to this comment
tunisievillage's 1 post US flag
11:07 PM

It's nearly impossible to find experienced people for this topic, but you sound like
you know what you're talking about! Thanks

link to this comment
girls-fish's 1 post US flag
Wednesday, 9 December 2020
11:19 AM

Very nice write-up. I absolutely love this site. Stick with

link to this comment
dorgiah's 1 post US flag
Thursday, 10 December 2020
1:26 AM

I used to be suggested this website by means of my cousin. I'm now not sure whether this post is written by him as no one else
realize such exact about my problem. You're incredible!

link to this comment's 1 post US flag
Select more comments

Your comment please
Please post a question, answer or commentUK Free TV is here to help people. If you are rude or disrespectful all of your posts will be deleted and you will be banned.

Privacy policy: UK Free Privacy policy.