If you're flying 2.4ghz there is no chance of those towers messing with your signal. If it's 72mhz, possibly but not likely. If your plane is diving hard on the final turn then you are over banking it at too low a speed causing a side slip. I'll wager that you have some adverse yaw which makes the plane not want to turn when you do a shallow bank, which then prompts you to roll it more. If you'll use your rudder to tighten up your turn and maintain no more than a 20 degree bank angle you'll find that nose dropping tendency goes away.

Johnbuckner- I may be a bit low on my estimates for most pilots. I was figuring it on not buying the best components and using the simplest chargers.