FWIW- I have the same type of unit. I hooked it up to an active antenna and while it powered the patch antenna it only output the GPGGA with all zeroes. It did see satellites but it refused to acquire a fix. Then I swapped the patch antenna for another one liberated from a USB GPS receiver (Navtech or something, lost the enclosure) and within 15 minutes, as promised, I had a fix with proper GPGGA and GPVTG data.

You may want to check the decrease in drawn current, these patch antennas need about 10 mA at 5 volts to work. Just unplug the MCX connector.

Good luck!