http://news.yahoo.com/s/ap/20070111/ap_on_hi_te/spy_coins I wonder how they get the signal out. Assuming the lids are metal and insulated they could be used as 'dipole' halves. Or use a microwave frequency and resonate the disks as is ? Peter P. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist