hello B

answers depend on are you using insulated or uninsulated wire
if using uninsulated wire you will want a insulator between the wire
and the "closed metal loop for fastening"
coiled up excess wire is no real prob excpt
if its uninsulated and the turns rub each other
just cut off the excess wire
if its insulated wire don't worry

wire hf receive antennas like a sloper or inverted L are very forgiving
realy can play around with it and not degrade how well it will receive
for most wire antennas, I use THHN # 14 gage stranded insulated house wire
sells cheap at home owners hell
wire antennas for receive are fun to play with
don't worry
just stay away from the power lines and you will be ok

yours truly Mac w8znx