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• The reference to Ray GAO, 09 Sep 2007 needs formatting following Wikipedia's guidelines, and also needs to be found! Where is it?
• Add reference to the COST 231 book, chapter 4, which as of today can be found at [1].
• Add reference to reference [51] therein, which is COST 231, "Urban transmission loss models for mobile radio in the 900- and 1,800 MHz bands (Revision 2)," COST 231 TD(90)119 Rev. 2, The Hague, The Netherlands, September 1991, check that the reference can be in fact found
• Use references to COST and to Action 231 as in the Cost 231 Model page: the final report cna be found there, too
• Check that the formulas are indeed consistent with the book Chapter 4 done --Pot (talk) 07:06, 27 May 2009 (UTC)[reply]
• Only after these, remove the Refimprove tag from the top
• Write a similar page about the COST Walfish-Ikegami model which is described in the same book right after the COST-Hata one.

Fpoto (talk) 07:46, 25 June 2008 (UTC)[reply]

• The mentioned frequency range the model can be used = 1500MHz-2000MHz, could it be that the range should be 150MHz-2000MHz ?