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From: philip@axis.UUCP (Philip Peake)
Newsgroups: sci.physics
Subject: Re: FM radio reception
Message-ID: <761@axis.UUCP>
Date: Fri, 7-Nov-86 04:51:21 EST
Article-I.D.: axis.761
Posted: Fri Nov  7 04:51:21 1986
Date-Received: Sat, 8-Nov-86 06:56:37 EST
References: <162900001@uiucdcsb>
Reply-To: philip@axis.UUCP (Philip Peake)
Organization: Axis Digital, 135 rue d'Aguesseau, Boulogne, 92100, FRANCE
Lines: 14

In article <162900001@uiucdcsb> wsmith@uiucdcsb.cs.uiuc.edu writes:
>
>
>Why do FM radio's get better and then worse reception as you walk
>around in the room where they are located?

Basically because FM is normally transmitted at VHF (~ 100 Mhz).
So, your body is a significant fraction of the wavelength (~ 3 meters).
Moving a conducting body around in a room, where you already have a
compilcated standing wave pattern (due to reflections of the radio signal
from walls etc) will disturb the standing wave patterns - hnce the signal
received by your radio.

Philip