Any tips on preventing transport losses?

[Epicpoint]

I find when playing the campaign that the monthly loss of transports takes a huge drain on my budget even with max transport capacity and most taskforces set to protect. What am I doing wrong or what are some ways I can mitigate this problem? Thanks! Sorry if this is in the wrong place.

[vortex7227]

You need ships with high range and then make sure you have more tonnage and are on patrol

[Plazma]

I believe the number of ships * range/x = "protect value" vs enemy ships * range/x = "lose TR". In other words, put more ships and you will protect more, it will be nice to destroy most of the enemy ships and have big range of your ships. 

In reality I always have 2-3 time more losses of TR than AI, mostly on the beginning of campaign, when the enemy start lose more TR I simply wining the game. Please also observe where you lost the TR (north sea etc.)