The RSGB Guide to EMC -- Tackle RF interference problems and understand the underlying causes.

Transmitter Hunting -- Radio Direction Finding Simplified

AC Power Interference Handbook -- New insights into the causes, effects, locating and correction of power-line and electrical interference. 3rd Edition.

Electromagnetic Compatibility Engineering -- Now Shipping! -- The most comprehensive book on electromagnetic compatibility, including all the latest advances and developments in the field.

The ARRL RFI Book -- Second Edition. Practical Cures for Radio Frequency Interference.