We're in the Griffen Park area (Mt Roskill South/Lynfield North) which is surrounded by hills on the West & North (so hills between us and the transmitters). All our neighbours UHF aerials around us are on at least 2 metre masts pointing to Waiatarua. We currently have a combo aerial (VHF & UHF) that is 3 metres up and gets TV1 & TV2 well and TV3 marginally. Prime is "there" but unwatchable.
My questions are:
1) Our current aerial has a spec'd UHF gain of 8-14dB, dedicated UHF aerials I am looking at as a replacement for Freeview have a gain of 14-18dB. Obviously this is better, but practically will I see an improvement (RF being a black-art!)?
2) The two UHF aerials I am looking at are:
b) http://www.hillssignalmaster.co.nz/pages/HILLS_UHF.html (SF91)
Does anyone have a recommendation?
3) For directing the aerial in the past I have used a TV tuned to Prime and much going-up-and-down-the-ladder, does anyone have a better suggestion? One idea I had was to buy a USB DVB-T tuner and use my laptop with s/w showing signal strength - anyone used this approach?
4) And finally I see on the Kordia site that Waiatarua is horizontally polarised, and that Skytower (a possible alternative for me) is vertically - to clarify this means I should physically mount the aerial flat or on its side (horiz' or vertical)?