Pheasant Pen Pole spacing

[Thering95]

I am planning on building a pheasant pen that is 50'x 150'. Im just not sure what the spacing should be between the poles. I feel like 10 and 15 feet is to many poles but im not sure you could get away with 25 feet. Another thing I considered is spacing the wood posts 25 feet and putting green metal fencing posts in between? Just would like someone who actually has experience to help me out. Thanks!!

 

[plunk72]

My pen is 50x100. I used treated posts every ten ft. With snow load on the net it holds my welded wire fence good.