They won't need a wigwam, Tadpole. Broad beans grow in stiff stems and are not twiners. Theoretically they shouldn't need any support at all but, as we live in a windy area, I knock in a post at each end of the row and run a couple of strings down each side to contain the beans.

Hi "yes" as Bulbaholic has said No need for a wigwam,
Ive put what looks like a crusifix across the area i use for all my beans/peas etc and this contruction is about 5ft high "one at each end of the sown area's and then about 12inch from the soil ive put wire from one end to the next end and again approx 12inch ive repeated the same idea until im at the top of the cross section's,
By doing this you can just secure the plants as they grow or its a good strong structure for having netting thrown over it and then pegged down to ground level,
Im not very keen on using netting due to the messing about trying to get it cleared and rolled up after use.

Just a point here ref sowing beans, I grow both peas and bean together, they both like the same soil conditions and grow well together.
As ive said before i start my pea"s off in the plastic drain pipe i have fixed to the bench in the greenhouse,
when they're all through and the outside temp is ready i just unclip the drain pipe take it to the small tranch ive made at the bottom ot the growing frame, then over water the drainpipe and the compost with peas's just slides out into the pre/trench, any extra water will just drain away and help settle the peas in.
Simple way of getting a head start on your pea's.
And the drain pipe fits back into its brackets in the greenhouse and can be used for a late crop or as i use it for sowing taget seeds to help with the green/white fly problem.

I grow mine in a block rather than rows. Stakes at each corner (with intermediate ones if its a bigger block)and twine criss-crossed over the whole area. Its windy here.

Very useful info as I've got some dwarf ones too. Thanks for the question Tadpole.