it can be much easily done, check the link below, you can get true 特长窗帘架, like 3m, 4m, or even more

Cable Curtain Rod
http://www4.jcpenney.com/jcp/ProductsHOM.aspx?DeptID=25437&CatID=32025&CatTyp=LFS&ItemTyp=G&GrpTyp=SIZ&ItemID=0fa5433&ProdSeq=9&Cat=hardware&Dep=Window&PCat=Home+Sale&PCatID=31434&RefPage=ProductList&Sale=&ProdCount=23&RecPtr=&ShowMenu=&TTYP=&ShopBy=0&RefPageName=CategoryAll.aspx&RefCatID=31434&RefDeptID=25437&Page=2&CmCatId=25437|31434|32025


http://www4.jcpenney.com/jcp/ProductsHOM.aspx?DeptID=25437&CatID=32025&CatTyp=LFS&ItemTyp=G&GrpTyp=SIZ&ItemID=0f9d699&ProdSeq=8&Cat=hardware&Dep=Window&PCat=Home+Sale&PCatID=31434&RefPage=ProductList&Sale=&ProdCount=23&RecPtr=&ShowMenu=&TTYP=&ShopBy=0&RefPageName=CategoryAll.aspx&RefCatID=31434&RefDeptID=25437&Page=2&CmCatId=25437|31434|32025