I’ve been rethinking about the possibility of a ½-wave 80-m dipole on my plot without the need for a support pole.
I make one some years ago and was very happy with its performance - when portable and at my previous QTH – on 80m and higher bands using an ATU.
But, before I go to the time and trouble of making and erecting one, can I expect - all other things being equal - that a half-wave dipole will be less prone to receive noise than my existing end-fed long wire which has no counterpoise and probably an ineffective ground plane over my plot (consisting of a few cms of soil over 345-million-year-old Dalton limestone) ?
My wife and I have been out with a long tape measure this afternoon [important to get her buy-in up front]. There’s a mature tree on the edge of the property about 7m from the shack and I could attach a ~1m-long nylon cord to one of its branches and a lightweight 1:1 balun at the other end. There would be about 29m from the balun to the existing nylon cord (on a tall tree) at the far end of the back garden where my long wire is currently attached. There’s 20m in the opposite direction from the proposed balun to a tree on the edge of my front driveway. This tree belongs to my neighbour but I think it would be legal to attach something to one of the many branches that protrude well over my side.
One concern: the end of the dipole wire at the driveway end would be 5m away from those previously-mentioned pesky electricity & telephone cables on telegraph poles running up on my side of the road. The dipole wire would be almost at right angle to those cables (say about 80 degrees) so I think the risk of induced EMFs is low.
Another concern: the wire over the driveway would be visible from the road. It may attract attention. But I know from discussion with Phli @G4OBK and others that the low height of the wire (lower than the top of my bungalow roof and the Diamond X50 colinear on 2m pole on the chimney) does not need planning permission. I see nothing in the AoONB regs that would be a problem either.
Any comments before I go ahead?