Root [Sprint/Cricket] using external antenna vs internal

[slashbmw]

I read that, once you use the external antenna, your internal antenna stops working.

Is this true? Has anyone used the external antenna?

I also read that an omni directional antenna is better for sprint than a yagi.

Also, does anyone know what type of connector is needed to connect to the external connector? I'd like to get a stronger 4g LTE signal in my house.

Thx

Slash