John Smith I wrote:

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Power Received by a Hertz Antenna
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p style="margin: 0px 20" align="justify"b

font face="Arial" color="#800080" style="font-size: 10pt"P = 

(Psubt/subGsubt/subGsubr/sub/font/bobfont
face="Arial" color="#800080" style="font-size: 10pt"λsup2/sup)
/ (16πsup2/supdsup2/sup) /font/b/p
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whe
P = received power (W)
Pt = transmitted power (W)
Gt = gain ratio of transmitting antenna relative to an isotropic radiator
Gr = gain ratio of receiving antenna relative to an isotropic radiator
? = wavelength (m)
d = distance between antennas (m)

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