RADIO BROADCAST COVERAGE OF CITY AREAS 



135 



are based upon symmetrical distribution and do not include the effect 

 of irregularities, which an actual survey probably would reveal. 



Receiving in Apartment Houses 

 The surveys described above disclose the field strength distribution 

 as measured generally in the streets and open places. It does not dis- 

 close the details of field distribution in the immediate vicinity of a 



Fig. 11 — The effect of stee! structure apartment house building in shielding radio 



reception within it 



receiver. Perhaps the most difficult situation is that of the large 

 apartment house, particularly where it is desired to receive by means 

 of an indoor antenna. Two effects are encountered : First, the reduc- 

 tion in signal strength by virtue of the shielding effect of the building; 



