On 6/27/07, Rich wrote: > Light is a pretty short wavelength and it cannot pass through walls but > x-rays can, THz waves can but UHF, VHF HF and LF cannot. Define "walls"... THz, and Light, and RF passes through glass and lexan. Thz, Light, and RF don't pass through metal. Standard construction house walls mostly made of wood, pass RF and Thz, but not light. 2.4 GHz is attenuated more than 1 MHz. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist