This application is related to U.S. Patent No. 10,236,920, issued on March 19, 2019, entitled "Signal Transmitter and Methods for Transmitting Signals from Animals". Multiple versions of the new RF transmitter have been designed to address the research needs for the three main bat species (hoary, eastern red and silver-haired bats) that are most frequently killed by wind turbines. Option A will focus on minimizing the transmitter size and weight to study the endangered species of Myotis that could be too small to use the current RF transmitters commercially available. Option B will prioritize service life over the transmitter size, weight, and detection range. This option targets the tracking applications for studying the migratory behavior of hoary, eastern red and silver-haired bats, while still staying under the 5% tag-burden guideline. Option C will have the longest detection range of the three while keeping the transmitter size and weight reasonable. This long-range version of the transmitter will be suitable for studying the potential landscape scale attraction of bats to wind turbines, as well as their fine-scale movements across one or more wind farms. It is also useful for tracking for other wildlife such as birds and aquatic species such as fish.