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I'm with ADI this is precisely the style that we ended up with two years ago after an expensive array of other options.
It was also the cheapest as they are essentially Home aerials. Make sure you don't skimp on the cable and connectors and that they are fitted correctly. We also added a signal amplifier which was not that expensive either. Have a look at Screwfix for the aerial
Hi John You haven't said if you want to use it on a boat? the one i use on my boat is no better than the airials shown but the Ballad from Wards works very well and being the size of a tennis ball on a short pole is so inconspicuous that you can leave it on all the time, with perhaps the odd time you go under low bridge it doesn't get blown off direction and works while underway, it doesn't need dismantling to pack away ether it's much like a large ice cream cone, but if on a building the conventual aerial would be best as they don't need 12v power. John