tony sayer wrote...

Think how much better it would be with a decent Vertical dipole;-)..

Who knows why they use these halos?, DAB is a V dipole, it is the
standard council communal installation round here for sheltered housing
and flats, consisting of a large sat dish, FM halo, DAB dipole and two
TV aerials; one pointing north for Waltham and one south for Sandy
Heath all mounted on a sturdy pole.

Receiving two different TV regions with equally strong signals confuses
a great many Freeview boxes and TV sets, plus their elderly owners.

Equipment which detects this and allows you to choose a region cope
fine, but lots end up with the whole 70 channels duplicated in the
800's

In fact we did some tests on one of they and they did do better than a
coat-hanger .. which incidentally wasn't resonant;-!..

It gets those results through the use of massive amplification, whole
swathes of the VHF band are obliterated by the resulting harmonics from
the local main transmitters, (Peterborough and Geddington)



--
UnsteadyKen