suggestions above that QRP may be the 'problem' are absolutely off the mark.
I've done EXTENSIVE antenna testing, ONLY with QRP, and often with compromise antennas. I've relied on the RBN network when doing my multi-tap UNUN and Michigan Cacti testing.
The only format I've ever used is this:
TEST TEST TEST TEST de N8NK (No 'K' needed)
And because I'm not calling CQ, people won't call me when I'm doing my antenna testing and not in the mood, or not equipped, to have a QSO.
Typically I'm spotted on the first round within the 'states. By the time I've done a second transmission, I'm spotted globally if the band permist. Yep, using QRP.
I worked S. Argentina using 2.5 milliwatts. Care for a story?
'a QRP Story'
https://youtu.be/ja6e_uISvZ8 Chuck, N8NK