How much wire needed to wrap around a tube for antenna?

once around is about 6 cm of wire.

But I guess that you want many turns of wire, and want to know how many turns and how much wire to fill the 1 meter tube with tightly packed windings, in one layer only. (and that is a very long antenna!)

Diameter of a turn is 19 mm + 0.65mm + 0.65 mm = 20.3 mm

circumference is π times that or 63.8 mm

how many turns in 1 meter? each turn takes 1.3 mm plus a bit, call it 1.35 mm.

1000 mm / 1.35 mm = 741 turns

741 turns at 63.8 mm each = 47260 mm or 47 meters. About 155 ft.

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19mm dia = pi x 19 = 59.7 mm circumference

1 meter = 1000 mm / 1.3mm = 769 turns to cover the length of the tube each turn requiring 59.7 mm of wire so....

the toal length of wire you need is 59.7 x 769 = 45923 mm or about 45 meters of wire....I think 150 feet of wire would do it.

http://www.intuitor.com/resonance/radioTVres.html

more info for antenna basics