Long-Range 11dBi-3G-Ultra-Antenna from:
antennas-online.co.uk.
Mobile Provider Base Station Finder:
www.ofcom.org.uk/sitefinder/faq.
Television Transmitter Grid Reference Finder:
www.ukfree.tv/transmittersmenu.php
T-Mobile service has a habit of using some kind of compression software for pictures and adds a reference to it. Arguably acceptable for speeding up the pages though they make my pictures look rubbish. Well I now discovered it also added this bmi reference to the web pages I uploaded which is unforgivable. I didn't realise this till I used the new '3' modem bought today and they wouldn't appear when I was checking it's speed. I chose 3' using the mobile phone base station search you see below and has an excellent reception. I will be using the new modem for my website work in future. Lucky I found this out, because I nearly took the new modem back to '3', thinking it was there service that was slow. No Chance, it's brilliant!.
I also discovered why my punctiation turns into '?'. This appears to be due to using Wordpad as my editor. I will be filtering it through Notepad to correct this shortly
After giving up on searching the internet for my T-Mobile Base Station, I accidently fell on this site.
http://www.sitefinder.ofcom.org.uk/
It's a hard work interactive map, but if you persist, you can track down the best provider for your UTMS.
It will also help you decide whether the antenna might be helpful to you. I can tell you now that the Base Station I use is 3.2 miles away, and I get above 50% HSPDA signal which I find quite sufficient. (That is from a 90% GPRS signal without the antenna.)
I can also tell you the result of the 10 metre cable. The antenna in the same place with the longer cable did cause a slight drop in signal, however, either some inconsiderate builder put an object in the way, or the trees next door grew. I was forced to move the antenna to the top of our Bungalow. The result was getting the reliable 50% signal from the unreliable 40% before the obstruction, so the advantage outweighed the loss.
Just Aside: If you want to align your own television aerial, Google Earth is a brilliant tool. You can put your postcode at this site, www.ukfree.tv/transmittersmenu.php, and you can get the grid reference to your transmitter. You can actually see it in Google Earth. Then if you use the ruler from the position of your aerial to the transmitter, focus local to your aerial, you can see what local feature to point your aerial past. (Don't blame me if you fall off the ladder though!)
I now have the joy of 3.5Mbps at home!
It has been very frustrating since BT announced broadband had reached our area three years ago, because it didn't work. As I work from home, my dial-up internet was useless. So: After the most recent show of horrendous customer care from BT, I took a chance with mobile broadband.
I checked the coverage for the top networks and found T-Mobile had 2G in my street, but had an outlying area supporting HSDPA only 500 yards up the road. So I risked signing up for 24 months as I could use GPRS at home and travel up the road to synchronise large amounts of data at full speed .
I found GPRS was not reliable for VPN at home, so then I took the risk of investing in a 11dBi-3G-Ultra-Antenna for £80 from antennas-online.co.uk. (It's not that big; only about 30cm long. It's just a thin mast!) The only drawback was that I had to buy a network-free, Broadband Wireless Data Card for £160 to allow me to plug in the aerial. (Had I known, I would have taken the free data card option with T-mobile instead of the free USB modem, though I can use that for travel.)
Well the result was amazing!
I only expected reliable GPRS, but achieved a weak but reliable signal for HSDPA. If I raise the aerial as far as the 5 metre cable would allow with my laptop away from my desk, I can get an acceptable three-bar signal. I have ordered a 10 metre cable and will update this page with the results. (Any gain in signal achieved in positioning may be lost due to the cable length.) 
I would recommend this to anyone who is on the outskirts of wireless coverage with a badly maintained land-line. It is by far the best connection I have ever had, (even compared with wireless hotspots using Wifi). There are various choices of connectors for the data cards, so it would be wise to make sure the option for the aerial is compatible with the data card and the card will support an external aerial if getting that first.