Source information for my statements about the necessity of an external antenna for HD radio even when a more then adequate analog signal was present without the additional antenna:NPR Labs IBOC Field Service Bulletin No. 02.20060216, Feb. 16, 2006An article by Chriss Scherer about the NPR tests are published in the supplimental insert "Insight to IBOC", Radio May, 2006That pretty much blows away all the wild claims by HD Radio supporters about signal parity for analog FM and HD coverage.Now if we could just get the HD Radio supporters to admit to all the other false or inflated claims.I believe HD Radio may just be the next ENRON.