Try having a look ON www.tomchambers.co.uk.

If it's the same one that a friend of mine has, the bottom of the four legs just push into the ground or the whole arch could be self-standing, but he has set the legs in concrete. Hope this helps?

Thanks for those. I checked the T.C. site but that wasn't specific either. I'll keep looking and will leave the question out there for some more feedback.

There will be a contact us page on the TC website - why don't you try email them and ask. I would do as Myron's friend has done. Finding out the length of the feet and comparing to the actual height of the arch will give a rough idea on how sturdy it would be.

I bought one this year. they go down about 10" into the soil then there are cross struts that can be pegged down/screwed down too. I have been delighted with mine.

Thanks Seaburngirl, that's the kiddy!