Above is a table that was made for me by Bert PA1B his blog can be found here .
Shortly after reading my QRPp WSPR blog post
Bert sat down collected my data and made the above table. It shows the calculated lowest possible power in milliwatts. Bert explained to me that the "calculated" lowest power, is the power that could be used (by my dinky antenna setup) to be received with an SNR of -29dB. From the above table it would seem that the 100mW's of power I was using for some contacts could had been considered QRO power!